Introduction
Alcohol abuse/dependence is defined as a maladaptive pattern of drinking that results in clinically significant impairment or distress [
1]. Recently, alcohol abuse/dependence among medical students is a serious public health concern. Multiple studies have demonstrated that alcohol is one of the most frequently used substances among medical students [
2,
3]. Many medical students reported alcohol-related disorders, ranging from 32.4 to 34.4% in the United States [
4,
5], 19.2% in Norway [
6], 22.6% in the Republic of Korea [
7], 21% in France [
8] and 4.57 to 8.25% in China [
9,
10].
Previous studies have suggested that alcohol abuse/dependence among medical students can have serious personal and public ramifications. On the one hand, alcohol abuse/dependence in medical students is associated with an increased risk of physical and mental health problems, such as cirrhosis, pancreatitis, and suicide behavior [
11,
12]. On the other hand, alcohol abuse/dependence is often accompanied by antisocial behaviors, alcohol impaired driving, and violence, which can have negative impacts on the whole society [
13,
14]. In addition, there may be potential long-term consequences of alcohol abuse/dependence in medical students. Previous studies suggested that alcohol use during medical training significantly increases the risk of alcohol use disorders later in their careers as physicians [
15‐
18], which increases the risk of medical errors and contributes partly to the disturbingly high divorce and suicide rates [
19,
20]. Moreover, it is also worth noting that drinking alcohol at any age is legal in China, which means that medical students are not legally restricted in their purchase and use of alcohol. Therefore, it is necessary to early identify alcohol abuse/dependence among medical students, in order to reduce their risk of short- and long-term adverse consequences.
A number of researchers have explored related factors associated with alcohol abuse/dependence. Firstly, a growing body of evidence has demonstrated gender differences in a variety of aspects of alcohol use in the general population. For example, males are more likely than females to engage in harmful drinking [
21‐
24]. Besides, the predictive effects of many psycho-sociocultural variables (such as anxiety disorders) on alcohol-related problems also differ between males and females [
25,
26]. Gender differences in physiological (e.g., alcohol pharmacokinetics and the effects of alcohol on hormones) and socio-cultural factors may account for these differences [
23]. Secondly, previous researches had indicated that alcohol abuse/dependence may be associated with mental distresses [
5,
27,
28]. For example, a study of 4,402 US medical students suggested that alcohol abuse/dependence was strongly related to burnout [
5]. In addition, depression, anxiety, and sleep-related problems might also be related factors to alcohol abuse/dependence [
29‐
32]. Notably, the outbreak of coronavirus disease 2019 (COVID-19) may also have had a negative impact on alcohol relative problems [
33]. An increase in alcohol consumption was observed among college students [
34,
35] and general population [
36] during the COVID-19 pandemic. Furthermore, researchers suggested that the negative mental health consequences caused by the measures to curb COVID-19 transmission might be long-lasting even after the public health risk has been abated [
37]. Therefore, it is important to screen medical students for alcohol abuse/dependence even after the pandemic.
However, some gaps in current research on alcohol abuse/dependence among medical students exist. Firstly, gender differences regarding alcohol abuse/dependence among medical students have been inconsistent across studies. Some studies reported no difference in the percentages of at-risk drinkers between male and female medical students [
38,
39], while a study conducted in Spain indicated that female medical students were more likely to be “at risk” [
40]. Secondly, medical school is a significant period of psychological distress for students [
41,
42]. Mental distress such as burnout, depression, and anxiety are prevalent among medical students [
43]. However, no current research has explored whether mental distresses have different effects on alcohol abuse/dependence between different genders. Lastly, previous studies of alcohol abuse/dependence among medical students during the COVID-19 pandemic involved only a small number of participants [
44‐
46], and little is known about this problem among Chinese medical students after the outbreak of COVID-19. Therefore, gender differences in the prevalence and correlations of alcohol-related disorders among medical students during the post-COVID‑19 pandemic period are worthy of further investigation.
This study aimed to identify the prevalence and gender-specific related factors for alcohol abuse/dependence among Chinese medical undergraduates during the post-COVID‑19 pandemic period. We hypothesized that 1) alcohol abuse/dependence is common among Chinese medical undergraduates during the post-COVID‑19 pandemic period, 2) compared to female medical undergraduates, male students are more likely to engage in alcohol abuse/dependence, and 3) among Chinese medical undergraduates, the association between alcohol abuse/dependence and mental distresses (i.e., learning burnout, depression symptoms, anxiety symptoms, excessive daytime sleepiness, and history of mental disorders) may significantly differ between males and females.
Method
Study design and participants
A cross-sectional web-based survey was conducted between October 20, 2020, and April 5, 2021 in China. During this period, the COVID-19 pandemic was subsiding in most areas of China and medical undergraduates were returning to campus. This study is a part of a large online study on the mental health of medical students and professionals in China [
47,
48]. We used the snowballing sampling technique to recruit participants. The inclusion criteria included 1). undergraduate medical students; 2). Age greater than or equal to 18 years old. The excluded criteria were as follows:1). non-completion of the questionnaire; 2). invalid questionnaires. The researcher predetermined the criteria for determining an invalid questionnaire: (1) wrong answers for the general knowledge question; (2) all the answers are the same throughout the questionnaire; and (3) there is inconsistency in the logical consistency check.
Sample size
A sample size of 3008 produces a two-sided 95% confidence interval with a width equal to 0.020 when the sample proportion is 0.083. Sample proportion based on alcohol abuse/dependence reported by 8.25% of Chinese medical students in previous study [
9]. The sample size was calculated using PASS 15.0.5. Given the possibility of invalid questionnaires, the sample size should be increased by 10%. Therefore, this study requires at least 3,308 participants.
Data collection
In order to recruit a large number of participants as conveniently as possible, we used the snowballing sampling technique. The data were collected via an online survey platform (
http://www.wjx.cn) and a social media platform (WeChat) in China. First, 40 medical students and medical university teachers were selected as the “original delivers”, all of whom were members of this research group. They shared this survey link through WeChat group and Moments to invite their classmates or students to participate in this survey. These delivers and potential participants are WeChat friends or in the same WeChat group. By clicking on the survey link to participate in the study. In addition, participants were also encouraged to share this survey link via their WeChat group and Moments. Only participants who responded to all the questions were able to submit the questionnaire, thus, there were no missing data in this study.
Questionnaire development
The online questionnaire was written in Chinese. This survey included items on alcohol abuse/dependence, mental distresses (learning burnout, depression symptoms, anxiety symptoms, excessive daytime sleepiness, and history of mental disorders), as well as basic demographic information (age, gender, relationship status, monthly income, and years of school). Before starting the final questionnaire dissemination, it was piloted on 20 medical students. These piloted medical students were not included in the final analysis.
Alcohol abuse/dependence
The Alcohol Use Disorders Identification Test-Consumption (AUDIT-C) was used to identify respondents with alcohol abuse/dependence [
49]. The Chinese version of AUDIT-C has been tested for validity and reliability [
50]. The AUDIT-C consists of 3 items, assessing the amount and frequency of alcohol consumption as well as the frequency of having 6 or more standard drinks on one occasion. The total score of AUDIT-C ranges from 0 to 12, with a cut-off point of ≥ 3 (for female students) or ≥ 4 (for male students) indicating alcohol abuse/dependence [
51]. The AUDIT-C is highly reliable with reliability coefficient (Cronbach's α) of 0.828.
Learning burnout
The Learning Burnout of Undergraduates Scale (LBUS) was used to identify respondents with learning burnout [
52]. This scale was developed specifically to assess learning burnout among college students and has been widely used in China [
53]. The LBUS includes 20 items, with a total score ranging from 20 to 100 and a cut-off point of 60 indicating learning burnout [
54]. LBUS has strong internal reliability with Cronbach's α of 0.898.
Depression and anxiety
The Chinese version of the 9-item Patient Health Questionnaire (PHQ-9) and the 7-item Generalized Anxiety Disorder Scale (GAD-7) were used to assess the respondents’ depression and anxiety symptoms [
55,
56], with a cut-off point of 10 in PHQ-9 indicating the presence of moderate or severe depression symptoms [
57] and a cut-off point of 10 in GAD-7 indicating the presence of moderate or severe anxiety symptoms [
58]. The reliability coefficients (Cronbach's α) for the GAD-7 and PHQ-9 showed excellent internal consistency, which was 0.908 and 0.871 respectively.
Excessive daytime sleepiness
The Epworth Sleepiness Scale (ESS) was used to assess daytime sleepiness among participants [
59]. The Chinese version of ESS is a reliable and widely used questionnaire in China [
60]. Participants with a total score of ≥ 11 were considered to have excessive daytime sleepiness [
61]. The reliability of ESS is acceptable with Cronbach's α of 0.771.
Data quality control and bias
Firstly, each IP address can only fill in the questionnaire once to avoid repeated data collection. Secondly, the criteria for invalid questionnaires were set in advance by the researcher and the sample size was higher than the minimum required sample size. Therefore, the effect of deleting the invalid questionnaire on the results of the study was negligible.
Statistical analysis
We used standard descriptive statistics to characterize the responding medical undergraduates. To screen out the independent variables associated with alcohol abuse/dependence in the male and female groups, we first performed univariate analysis by using chi-square test and Mann–Whitney U test, as appropriate, to compare inter-group differences in related variables. Variables with significant inter-group differences in the univariate analysis (p < 0.05) were further included in a multivariable logistic regression model. The independent variables used in the two-step screening included mental distresses (learning burnout, depression symptoms, anxiety symptoms, excessive daytime sleepiness, and history of mental disorders) and basic demographic data (age, gender, relationship status, monthly income, and years of school). All the statistical analyses were performed using SPSS Version 26 (IBM, Armonk, NY, USA). All tests were 2-tailed with a significance level of 0.05.
Ethical considerations
This study was approved by the ethics committee of the Second Xiangya Hospital of Central South University (LYF2020075). All the participants were voluntary, with informed consent provided through an online survey platform (
http://www.wjx.cn). Immediately after completing the survey, participants will receive a report on their mental health status and recommendations to promote their mental health status. In addition, participants will be given the contact information of our team of mental health professionals to enable them to contact us for help.
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