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Psychiatry Investig > Volume 18(7); 2021 > Article
Lin, Gu, Guo, Meng, Wang, Li, Deng, Zhao, Ma, Li, Chen, Cheng, and Li: The Gender-Sensitive Social Risk Factors for Internet Addiction in College Undergraduate Students

Abstract

Objective

The current study aims to explore precipitating and social risk factors for internet addiction (IA) in university undergraduate students, and to provide evidence for interventions and the early prevention of IA in different genders.

Methods

Four thousand eight hundred and fifty-eight college sophomores completed an online survey on their internet use-related behaviours and social risk factors.

Results

We found that more male (8.3%) than female students (5.4%) had moderate and severe IA. The main online activity in the moderate and severe IA groups was online gaming in males and online streaming in females. Roommates engaging in similar internet-based entertainment was a risk factor of IA only for males, while not being in a romantic relationship was a risk factor of IA for females only. Infatuation with the internet before college and adjustment problems for college life were shared risk factors for both genders in the mild and moderate IA groups.

Conclusion

IA was a common phenomenon in college students with shared and unique precipitating and social risk factors in males and females. The gender-sensitive risk factors for IA warranted earlier and individualized intervention and prevention strategies for IA in this population.

INTRODUCTION

The internet use has grown exponentially during the past two decades. The development of the internet has brought convenience but also problems such as internet addiction (IA). Young [1] defined IA as losing control over the time spent on the internet. IA could potentially impair academic and occupational function as well as family life [2]. Although there have been few worldwide studies on the prevalence rate of IA, studies conducted in different geographic regions suggest that it is a severe problem shared by many countries [3]. Furthermore, IA is associated with an increased rate of mental health problems. People with heavy IA, such as pathological heavy online game consumers, are likely to develop psychiatric disorders such as depression, social anxiety, and somatic symptoms [4].
The use of internet-based entertainment differs by gender and geographic region. In the United States, male internet users spend more time on pornography, and females usually spend time on online shopping [5]. In Europe, male internet users usually play single-player online games, while females spend most of their time on social media [6]. In Korea, 56.3% of males play online multiplayer games [7]. In Hong Kong, 30% of participants play online games [8]. Similar to other addictive behaviours, people engage in online entertainment for different reasons. Shiffman and Rathbun [9] found that people use smoking as a way to cope with negative affect. IA has a clinical presentation similar to that of substance abuse and behavioural abuse, such as withdrawal symptoms, tolerance, and craving [10]. It is worth noting the difference between males and females in addictive behaviours. For example, women were more likely than men to use smoking to cope with negative affect, and a more recent study suggested that men are more likely to report somatic symptoms such as “ill, in pain, or uncomfortable” as triggers for using drugs [11].
Previous studies suggested that the severity of IA is positively correlated with the amount of time individuals spend on the internet [12]. However, currently, as technology use skyrockets, internet-based entertainment has become more accessible through smartphones, tablets, and other portable gaming devices (e.g., Nintendo Switch). Consequently, it is more difficult to assess the amount of time and the frequency of use in the traditional manner [13,14]. In a more recent study, Li et al. [15] found that sustained time spent on online entertainment tends to increase as IA severity increases. The duration of sustained online entertainment for each episode of internet use might be a better indicator to measure the amount of time of internet use.
Existing studies on risk factors for IA were conducted under the biopsychosocial model. Under this model, the family environment was considered one of the most important social factors. Single-parent, frequent migration, left-behind by parents during childhood, and deceased parents were the most common risk factors [16]. Boys who experience negative life events are more susceptible to IA [17]. In addition to the family environment, interpersonal interaction with peers has also been studied. As a platform for sharing similar activities, the internet is a place where adolescents socialize with each other. As a result, the influence of friends could exacerbate adolescents’ dependence on the internet [18,19].
Previous studies have suggested that biological factors, social environment factors (e.g., family, friends, etc.), and other psychological conditions (e.g., depression and social anxiety) together impact individuals’ internet use behaviour [20]. Positive emotions such as happiness, relaxation, confidence, and the sense of achievement that people receive from online activities could serve as moderators that exacerbate IA [21]. The findings are mixed on the effect of socioeconomic status (SES) and geographic location on IA. Family SES was found to be a predictor of IA. Specifically, children from higher SES families were more vulnerable to IA [22-24]. Parents’ unemployment status and low education levels were also found to be associated with a higher risk of IA [25]. However, findings are inconsistent, and other studies suggested that parents’ education level and family socioeconomic status had no impact on children’s IA [17,26].
In the current study, we explored precipitating and social risk factors for internet addiction (IA) in university undergraduate students in order to provide evidence for interventions and the early prevention of IA in different genders.

METHODS

Participants

The investigation was carried out at a comprehensive university in mainland China. All sophomores (9,367) were invited to complete a questionnaire online in November 2013. A total of 4,858 (51.86%) responded and completed the survey.

Informed consent and confidentiality

The present study was approved by the Medical Ethics Committee of West China Hospital of Sichuan University (2013, No.185). Online written informed consent was obtained from all participants. Volunteers’ confidentiality is in no way breached, and do not use real names, initials, or disclose information that might identify a particular person without informed consent for publication.

Demographics

The demographics collected in this self-made questionnaire included gender, age of participants, and social risk factors below in this survey.
The social risk factors included number of relocations (migration numbers), childhood trauma experience, if father and/or mother deceased, infatuation with the internet before college, similar online activities in roommates, a romantic relationship, and unpleasant events on campus. They were defined as follows:

Number of relocations (migration numbers)

Refers to the number of times the family’s permanent residence was relocated. For the convenience of statistical analysis, those who had no relocation experience were assigned a value of 1, 1 relocation experience was assigned a value of 2, 2 relocation experiences were assigned a value of 3, and 3 or more relocation experiences were assigned a value of 4.

Childhood trauma experience

In this study, childhood trauma experience covers neglect and physical abuse before the age of 16. The Childhood Trauma Questionnaire has been used to evaluate childhood traumatic experience and verified as having good reliability and validity [27,28].

If father and/or mother deceased

Whether parents are deceased.

Infatuation with the internet before college

This item was self-reported; infatuation refers to an unreasonable passion for engaging in online activities.

Similar online activities in roommates

Whether roommates share similar online activities.

With a romantic relationship

Whether the participant was experiencing a romantic relationship or other relationships.

Unpleasant events on campus

Frequency of suffering unpleasant events after entering the university.

Internet use behaviours

We recorded the types of online entertainment activities (playing games, browsing information, chatting/posting comments, watching movies/TV series), the duration of sustained online entertainment (sustained engagement with online entertainment in hours for each internet use) and potential triggers for online entertainment activity, including boredom [29,30], loneliness/depression/escape [31-33].
Young’s Internet Addiction Test (IAT) revised edition by Young, a 20-item self-evaluation scale including 6 levels (0=not applicable, 1=almost never, 2=occasionally, 3=sometimes, 4=often, and 5=almost), was used in the present study. An IAT score of 50 is commonly considered the cut-off score for IA, which means that individuals who scored 50 or higher were considered to have IA, and those who scored lower than 50 were considered being without IA [34,35]. The total IAT score can be categorized into four classes of severity (normal: 0 to 30; mild: 31-49; moderate: 50-79; severe: 80-100) [36]. Young’s IAT has been translated into different languages and has been verified to have good reliability and validity [37,38]. The Chinese version was adopted for the present study (Cronbach’s alpha: 0.9085) [39].

Statistical analysis

The participants were separated into three groups (normal group: 0-30, mild IA group: 31-49, moderate and severe IA group: 50-100) based on the scores using the latest revision of the IAT [36]. SPSS19 was used for data analysis. Two-sample t-tests, chi-squared tests and analysis of variance (ANOVA) were used for continuous variables and categorical variables as appropriate. Multiple logistic regression analysis was applied to predict the risk of mild IA, moderate and severe IA. The statistical significance level was set as p<0.05 (two-tailed). The Bonferroni correction and the corrected p-value were used to adjust the p-value while conducting the chi-square analysis.

RESULTS

Demographics

A total of 4,858 (51.86%) sophomores participated in the cross-sectional study. Among these volunteers, 48.93% (2,377) were males and 51.07% (2,481) were females. The mean age was 19.58, SD=0.87.

Prevalence of IA and IAT mean scores

The Cronbach’s alpha coefficient and Guttman split-half coefficient of IAT were 0.915 and 0.845, respectively, in the present study.
The prevalence of IA in total was 6.81% (331/4,858). The IA rate was 8.3% in males (197/2,377) and 5.4% in females (134/2,481). A higher IA rate in male participants (χ2=23.115, p<0.001) was found in the current study among the 4,858 respondents. Furthermore, there were significant differences in the mean IAT score between the three IA severity groups (F= 4.344, p<0.001) (Table 1).

Online entertainment activities, triggers, and duration of sustained online entertainment

The duration of sustained online entertainment in the moderate and severe IA groups (approximately 5 hours) was significantly higher than that in the normal group (approximately 2 hours) for both males and females.
Online gaming is the main online entertainment activity among male students in the moderate and severe IA groups (55.8%), whereas only 27% of male students in the normal group play online games.
The main trigger of online entertainment was boredom (male >60%, female >70%); however, negative affect was the most prevalent trigger of online entertainment activities in the moderate and severe IA groups (male 18.2%, female 12.7%, p<0.001).
There is no statistically significant difference between the two gender groups in the duration of sustained online entertainment (males 2.72±3.234, females 2.58±2.983; t=1.527, p=0.527). Compared to the normal group, the moderate and severe groups significantly differed in online entertainment activities, triggers, and duration of sustained online entertainment (p<0.001) (Table 2).

Social environmental risk factors for internet addiction

The average number of relocations (migration numbers) was 1.92±1.046. The average score on childhood trauma experiences was 1.01±1.973. A total of 7.5% of respondents (366/4,800) had a father and/or mother deceased, and 12.5% of respondents (607/4,857) had been infatuated with the internet prior to college. A total of 72.1% of students (3,504/4,858) had roommates with similar online activities; 77.6% of students (3,768/4,858) did not have a romantic relationship; and 9.4% (456/4,858) suffered unpleasant events on campus.
Students in the moderate and severe IA groups were more likely to report childhood trauma, being infatuated with internet entertainment before college, not in a romantic relationship, and suffering unpleasant events on campus (p<0.05). Males in the moderate and severe IA groups were more likely to report relocation and father and/or mother deceased.
Additionally, more than 70% of male and female students reported that their roommates engaged in similar online entertainment activities, but the difference between the moderate and severe IA group and the normal group was only marginally significant (p=0.051) (Table 3).

Multiple logistic regression analysis of risk factors for IA in gender interaction

The mild, moderate and severe IA as the dependent variables were entered in logistic regression models (the normal group was taken as the reference variable). Independent variables, including if father and/or mother deceased, infatuating with network before college, unpleasant events on campus, with a romantic relationship, similar online activities in roommates, childhood trauma experiences, migration times, were entered in logistic regression models by stepwise analysis after having an interaction for male and female, respectively. The model has an acceptable goodness of fit (χ2=6,013.952, p<0.001). Infatuation with the internet before college and unpleasant events on campus were common risk factors for mild and moderate IA in both gender groups (all p<0.001). In particular, infatuation with the internet before college was the strongest predictor of moderate and severe IA (male: OR=5.739, 95% CI: 3.862-8.529; female: OR=12.239, 95% CI: 7.523-19.911).
Roommates engaging in similar online activities displayed a significant effect on male students’ IA (mild IA group, p<0.001, OR=1.535, 95% CI: 1.249-1.886; moderate and severe IA group, p=0.002, OR=1.829, 95% CI: 1.240-2.698). In contrast, female students addicted to internet entertainment activities were influenced by the absence of romantic relationships (mild IA group, p=0.019, OR=0.768, 95% CI: 0.616-0.958; moderate and severe IA group, p=0.006, OR=0.479, 95% CI: 0.284-0.809) (Table 4).

DISCUSSION

In the present study, we found that more male than female students had moderate and severe IA. In the moderate and severe IA group, both male and female students tended to uninterruptedly use the internet for more than 5 hours once they started. The main online activity for the male students in the moderate and severe IA groups was online gaming, while female students with moderate or severe IA preferred to online streaming (e.g., watching movies and dramas). Boredom was the most prominent trigger for using internet-based entertainment. However, internet use triggered by negative emotion was more likely to develop into moderate or severe IA. Infatuation with the internet before college and adjustment problems for college life were shared risk factors for both gender groups in the mild and moderate IA groups. Roommates engaging in similar internet-based entertainment was a risk factor only for IA in male students, and not being in a romantic relationship was only a risk factor for IA in female students. Relocation, the death of one or both parents, and childhood traumatic experience only affected mild IA.

Type of internet use and different effects of IA in different genders

The main type of internet-based entertainment was different between male and female participants. Similar to previous research, our study found that online gaming is the main type of IA for male students [4]. For female students in the moderate and severe IA group, 51.5% chose to use online streaming services as their main internet-based entertainment. This is possibly due to the relatively easy accessibility of online streaming services. And it is also a risk factor for IA in female students, suggesting that research on female college students’ IA should focus on this subtype. The different choice of internet-based entertainment between male and female students may be due to their unique needs and goals in using the internet.
It was suggested that the online activities of IA might be gender-sensitive, and the risk factors for IA might have some difference between males and females [40,41]. A number of studies explored the effects of IA by gender and reported different results. For instance, in 2011, Wang et al. [42] studied 14,296 high school students and found that 12.2% of them were problematic internet users (PIUs), While they did not find gender difference between PIUs and non-PIUs by using generalized mixedmodel regression analysis. Regards to the means of IA, female adolescents seem to be prone to a higher risk for smartphone use addiction than males [40], though an independent study revealed opposite conclusion [41]. Teng et al. [43] found lower self-esteem and poorer social support as the important risk factors for IA, and showed different correlations in males and females. Kim et al. [44] reported that the novelty-seeking, self-transcendence, and daily time spent gaming predicted IA in males significantly. Notably, males with IA also showed more serious social problems than females [45].

Duration of sustained online entertainment

The duration of sustained online entertainment was used as an indicator of prolonged internet use for IA. It varied from 2 hours in the normal group to 5 hours in the moderate and severe IA groups. Previous studies usually use “how many hours per day” and “how many days per week” to assess the severity of IA [13,14]. Wei et al. [4] suggest that women tend to have shorter duration of sustained online entertainment, which is contradictory to our findings. Our study found no statistically significant difference between gender groups, which suggests that it could potentially serve as a universal indicator of the severity of IA for both men and women.

Triggers of internet-based entertainment

Boredom, stress, and negative affect were common triggers of massive internet use [46,47]. Boredom was the main trigger of mild IA. Participants in the moderate and severe IA group reported a significantly higher incidence of negative affect-triggered internet use than boredom-triggered use. This suggests that online entertainment serves as a coping mechanism for individuals with moderate to severe IA. Female students rarely report invitation from friends as a trigger for online entertainment, while it is the second most reported trigger from male students.

Risk factors for IA

History of using the internet (infatuation with the internet) is considered a predictor of IA. Most individuals with internet game addiction reported having their first contact with online games in primary school and with internet overuse in middle school [15]. the time point of first contact might influence the severity of IA [4]. Our study yields a similar finding that experience with online games during early adolescence has an important impact on internet game addiction. Additionally, infatuation with the internet before college and adjustment issues at the beginning of college are common risk factors across gender groups.
IA could be a result of interaction between genetic and environmental factors. First-degree relatives of pathological gamblers showed significantly higher incidences of addictive behaviours compared to control groups [48,49]. A twin study discovered that IA is 20 to 48 percent influenced by genetic factors [50,51] and over 50 percent by environmental factors [50]. The current study found that infatuation with the internet before college and early encounters with the internet at a young age are prominent risk factors for IA. This suggests that genetic vulnerabilities combined with the influence of the family environment may play an important role in early contact with online entertainment and IA in childhood or adolescence.

Clinical implication

Since the current study found that boredom is a common trigger of internet use for college students, it is important to develop intervention strategies to target this problem. In China, high school students commonly spend an enormous amount of time preparing for college entrance exams. After the exam, students who were successfully admitted by colleges have much more free time to be spend by their own planning. Helping students to engage in meaningful campus activities might relieve their boredom, and reduce the likelihood of students being addicted to the internet. Additionally, schools should pay close attention to the differences in triggering events between gender groups and provide interventions accordingly. Furthermore, online entertainments were potentially served as a coping mechanism for negative emotion, discussing emotional regulation and skills dealing with stress events with students in their earlier college life could be of beneficial.

Limitations

There were a number of limitations in present study. Firstly, the response rate in the cross-sectional study was only 51.86%, which might result in sampling bias. Secondly, since our study is conducted on college undergraduate students, the results may have the limitation of being generalizable to the broader population. Further studies should be done to validate our findings.

ACKNOWLEDGEMENTS

This work was partly funded by National Nature Science Foundation of China Key Project (81630030 and 81920108018); the Department of Science and Technology of Sichuan provincial government (2019YFS0535); and the 1.3.5 Project for disciplines of excellence, West China Hospital of Sichuan University (ZY2016103, ZY2016203 and ZYGD20004); Education Department of Sichuan Province, China (11SB142); Sichuan Provincial Health and Family Planning Commission, China (17PJ077) and the cooperation program of North Sichuan Medical College and Nanchong City, China (18SXHZ0556).

The authors have no potential conflicts of interest to disclose.

Authors’ contribution

Conceptualization: Tao Li, Xia Lin, Andy S.K. Cheng. Data curation: Wan-jun Guo, Ya-jing Meng. Formal analysis: Ming-li Li. Funding acquisition: Tao Li, Xia Lin. Investigation: all authors. Methodology: all authors. Project administration: Hui-yao Wang, Xiao-jing Li. Resources: all authors. Software: Wei Deng, Lian-sheng Zhao. Supervision: Xiao-hong Ma. Validation: Hui-yao Wang, Xiao-jing Li. Visualization: Ting Chen. Writing— original draft: Jing-yan Gu, Xia Lin. Writing—review & editing: all authors.

Table 1.
The rate and mean scores of internet addiction (IA) in males and females
IA severity Rate
χ2 p-value IAT scores
F p-value
Male Female Male Female
The normal group 1,272 (53.5) 1,461 (58.9) 23.115 <0.001 23.66±4.197 24.09±4.080 4.344 <0.001
The mild IA group 908 (38.2) 886 (35.7) 37.89±4.794 37.48±4.978
The moderate and severe IA group 197 (8.3) 134 (5.4) 59.91±8.962 58.15±9.382
Total 2,377 (100.0) 2,481 (100.0) 32.1±11.829 30.71±10.304

Data are presented as the mean±standard deviation or N (%). IAT: internet addiction test

Table 2.
Sustained online entertainment duration, online entertainment activities and triggers in the moderate and severe IA groups compared with the normal group
Male
χ2/t p-value Female
χ2/t p-value
Normal group
The moderate and severe group
Normal group
The moderate and severe group
N=1,272 N=197 N=1,461 N=134
The sustained online entertainment duration (hours/every time) 2.14±2.174 4.94±7.725 -5.043 <0.001 2.20±2.140 4.76±9.434 -3.11 0.002
Online entertainment activities 78.397 <0.001 27.115 <0.001
Playing games 343 (27.0) 110 (55.8) 30 (2.1) 8 (6.0)
Browsing information 223 (17.5) 18 (9.1) 170 (11.6) 9 (6.7)
Chatting/post bar 147 (11.6) 28 (14.2) 213 (14.6) 23 (17.2)
Watching movies/TV series 478 (37.6) 31 (15.7) 923 (63.2) 69 (51.5)
Others 81 (6.4) 10 (5.1) 125 (8.6) 25 (18.7)
Online entertainment activity triggers 54.6 <0.001 48.506 <0.001
Boring 864 (67.9) 125 (63.5) 1,118 (76.5) 98 (73.1)
Lonely/depressed/escaping 98 (7.7) 46 (23.4) 87 (6.0) 28 (20.9)
Friends’ invitation 193 (15.2) 21 (10.7) 76 (5.2) 1 (0.7)
Others 117 (9.2) 5 (2.5) 180 (12.3) 7 (5.2)

Data are presented as the mean±standard deviation or N (%). 1) (%) is the percentage in column, 2) Alpha level was adjusted using Bonferroni correction. IA: internet addiction

Table 3.
Migration times, childhood trauma experiences, parents, infatuating with the internet before college, roommates, with a romantic relationship, unpleasant events on campus between the moderate and severe group and normal group
Social factors Male
t/χ2 p-value Female
t/χ2 p-value
The normal group
The moderate and severe IA group
The normal group
The moderate and severe IA group
N=1,272 N=197 N=1,461 N=134
Migration times 1.826±1.151 2.26±1.505 -3.864 <0.001 1.97±1.150 2.04±1.300 -0.681 0.496
Childhood trauma experiences 7.06±2.439 7.88±2.533 -4.484 <0.001 6.64±1.527 7.20±1.679 -3.386 0.001
If father and/or mother deceased
 No 1,174 (93.5) 166 (86.0) 13.387 <0.001 1,357 (93.8) 118 (89.4) 3.783 0.052
 Yes 82 (6.5) 27 (14.0) 90 (6.2) 14 (10.6)
Infatuating with the internet before college
 No 1,169 (91.9) 120 (60.9) 152.356 <0.001 1,409 (96.4) 95 (70.9) 148.884 <0.001
 Yes 103 (8.1) 77 (39.1) 52 (3.6) 39 (29.1)
Similar online activities in roommates 0.009 0.924
 No 404 (31.8) 49 (24.9) 3.795 0.051 420 (28.7) 38 (28.4)
 Yes 868 (68.2) 148 (75.1) 1,041 (71.3) 96 (71.6)
With a romantic relationship
 No 969 (76.2) 165 (83.8) 5.563 0.018 1,096 (75.0) 114 (85.1) 6.780 0.009
 Others 303 (23.8) 32 (16.2) 365 (25.0) 20 (14.9)
Unpleasant events in campus
 Rarely 543 (42.7) 33 (16.8) 515 (35.2) 14 (10.4)
 Occasionally 396 (31.1) 31 (15.7) 147.518 <0.001 579 (39.6) 38 (28.4) 111.463 <0.001
 Sometimes 231 (18.2) 75 (38.1) 292 (20.0) 49 (36.6)
 Plenty 102 (8.0) 58 (29.4) 75 (5.1) 33 (24.6)

Data are presented as the mean±standard deviation or N (%). 1) (%) is the column percentage, 2) The intergroup difference test of frequency was corrected by Bonferroni correction, 3) The corrected p-value of comparison between groups of the mean is: 0.05÷3 (factor numbers)=0.017, while p-value<0.017 means there is a significant difference between groups. IA: internet addiction

Table 4.
Multivariate logistic regression analysis of gender interaction risk factors of Internet addiction
Gender interaction risk factors The mild IA group (IAT: 31-49 points)
The moderate and severe IA group (IAT: 50-100 points)
B p-value OR 95% CI
B p-value OR 95% CI
Low High Low High
Intercept -3.955 <0.001 -8.261 <0.001
Male
If father and/or mother deceased 0.350 0.033 1.420 1.029 1.958 0.497 0.061 1.644 0.978 2.765
Infatuating with network before college 1.159 <0.001 3.186 2.440 4.158 1.747 <0.001 5.739 3.862 8.529
Unpleasant events on campus 0.276 <0.001 1.318 1.187 1.463 0.547 <0.001 1.728 1.432 2.087
With a romantic relationship -0.204 0.081 0.815 0.648 1.026 -0.417 0.071 0.659 0.419 1.036
Similar online activities in roommates 0.428 <0.001 1.535 1.249 1.886 0.604 0.002 1.829 1.240 2.698
Childhood trauma experiences -0.013 0.519 0.987 0.947 1.028 0.040 0.190 1.041 0.980 1.106
Migration times 0.105 0.026 1.110 1.013 1.218 0.147 0.071 1.158 0.988 1.358
Female
If father and/or mother deceased 0.076 0.665 1.079 0.766 1.520 0.667 0.033 1.948 1.056 3.592
Infatuating with network before college 1.421 <0.001 4.143 2.937 5.844 2.505 <0.001 12.239 7.523 19.911
Unpleasant events in campus 0.264 <0.001 1.302 1.162 1.458 0.489 <0.001 1.630 1.294 2.053
With a romantic relationship -0.264 0.019 0.768 0.616 0.958 -0.736 0.006 0.479 0.284 0.809
Similar online activities in roommates 0.335 0.001 1.398 1.143 1.708 0.388 0.064 1.473 0.978 2.221
Childhood trauma experiences 0.053 0.017 1.054 1.010 1.101 0.058 0.176 1.060 0.974 1.154
Migration times 0.073 0.107 1.076 0.984 1.176 -0.064 0.509 0.938 0.776 1.134

p<0.05 was considered statistically significant; Unpleasant events in campus: 1=rarely, 2=occasionally, 3=sometimes, 4=plenty; Similar online activities in roommates: 1=no, 2=yes; With a romantic relationship: 1=no, 2=others; Infatuating with the internet before college: 1=no, 2=yes; If father and/or mother deceased: 1=no, 2=yes; Migration times: 1=0, 2=1, 3=2, 4=3 and more. IA: internet addiction, IAT: internet addiction test, B: regression coefficient, OR: odds ratio, CI: confidence interval

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