From September to October 2021, Chongqing Health Education Institution and the Army Medical University carried out a web-based study to assess residents’ health care needs in Chongqing municipality. The target participants were Chongqing residents. A survey QR code was disseminated on popular Chinese social media applications such as WeChat for voluntary participation in our web-based survey, which was hosted on the Chinese Sojump site. The first page of the survey was a web-based consent form including study information. After reading the consent forms and indicating consent to participate in the survey, respondents were allowed to proceed. To avoid multiple submissions, only one submission per IP address was allowed. Ultimately, 14,466 participants were included in this study.

This questionnaire included 2 parts: demographic characteristics and OHIS behaviors. Demographic characteristics included age, gender, education, occupation, ethnicity, and area of residence, gender, education, and ethnicity. Age was measured by asking participants to indicate their numeric age, and other variables were measured with multiple-choice questions. The part on OHIS behaviors were included three questions. The first one dealt addressed having experience with OHIS, wherein participants’ OHIS behavior was measured with a single question, “Which sources are your main sources for seeking health information?” The response options included books and journals, broadcasts, television, PCs (desktops and laptops), mobile phones, lectures, professional staff, and advertisements. Participants who chose PCs and/or mobile phones as their main sources for seeking health information were considered to have experience with OHIS. The second one addressed major health topics in OHIS: health topics that the participants searched on the internet were captured by a multiple-choice question with response options including health behavior and literacy (such as diet, fitness, exercise, and drug usage), infectious diseases, chronic disease, first aid, and health policies (such as medical insurance). Participants could select one or more answers as their major health topics when searching on the internet. The third one addressed the main method of OHIS: the main method of seeking health information on the web was measured with a single item with response options including WeChat, Weibo, search engines (such as Baidu and Google), websites, short-video apps (such as TikTok), and others. Participants could select one or more answers as their main method of seeking health information on the web.

The study was carried out in accordance with ethical principals and was approved by the ethics review board of the Army Medical University (2023-5-02). Participants provided informed consent. All participants’ information was anonymized. There was no financial compensation for patients or researchers nor any source of funding that could lead to a conflict of interest for the study.

All data were input into an Epidata database (version 3.1) after checking and correcting errors. SPSS (version 22.0; IBM Corp) was used for analyses. A descriptive analysis (frequencies, percentages, and means with SDs) of the participant characteristics was performed. The chi-square test was used to compare OHIS behaviors among groups. Multiple logistic regression models were used to assess the influencing factors associated with OHIS. Statistical significance was set to a P value of <.05 (2-sided).

The demographic characteristics of the study sample are listed in Table 1. In total, 67.1% (9704/14,466) of the participants had OHIS experience. The average age was 46.2 (SD 18.0) years, while approximately half (51.8%, 7495/14,466) of the participants were younger than 45 years. More than half (52.0%, 7520/14,466) of the participants were female. Most participants (95.3%, 13,793/14,466) were of Han Chinese ethnicity. The percentage of participants residing in urban areas was 69.7% (10,090/14,466). Overall, 47.1% (6813/14,466) of participants were college graduates or had a higher level of education. The participants spanned all occupation groups.

As indicated in Table 1, OHIS experience significantly differed by age, ethnicity, area of residence, education and occupation (P<.05) but not by gender.

The variables with statistical significance in the chi-square test (Table 1) were analyzed using multivariate logistic regression. As shown in Table 2, participants aged 46‐60 years (odds ratio [OR] 0.782, 95% CI 0.695-0.880) or more than 61 years (OR 0.298, 95% CI 0.260-0.341) were less likely to have OHIS experience than those younger than 20 years. Participants who belonged to ethnic minorities (OR 0.621, 95% CI 0.513-0.752) were less likely to have OHIS experience than Han Chinese participants. Participants from rural areas (OR 0.815, 95% CI 0.734-0.906) were less likely to have OHIS experience than urban participants. Compared to the respondents with primary school education and below, those with junior high school education (OR 2.290, 95% CI 2.000-2.622), senior high school education (OR 3.274, 95% CI 2.765-3.877), college graduate degrees (OR 5.012, 95% CI 4.163-6.033), and postgraduate education (OR 4.809, 95% CI 3.442-6.720) were more likely to have OHIS experience. Based on the participants’ occupation, compared to civil servants, teachers (OR 1.407, 95% CI 1.118-1.770) and medical staff (OR 1.359, 95% CI 1.098-1.683) were more likely to seek health information on the web, while farmers (OR 0.656, 95% CI 0.525-0.820) were less likely to seek health information on the internet.

Table 3 shows the health topics searched on the internet by the study participants. Most of the participants (8483/9704, 87.4%) indicated that they sought information about health behavior and literacy. More than three-quarters of the participants used the internet to find information about infectious diseases (78.6%, 7628/9704), chronic diseases (76.0%, 7375/9704), and first aid (75.0%, 7277/9704). More than half (58.6%, 5688/9704) of the participants searched for health policy information on the web.

Participants reported 1 or more different sources of health information that they sought on the web. The majority of participants (7468/9704, 77.0%) used WeChat. More than half of the participants indicated that search engines (5547/9704, 57.2%) and short-video apps (5359/9704, 55.2%) were their main sources. A total of 4079 out of 9704 (42.0%) participants used Weibo. Websites and web-based courses were used for seeking health information on the web by 36.3% (3527/9704) and 31.3% (3034/9704) of participants, respectively. The prevalence of the source of web-based health information among the participants with OHIS experience is shown in Table 4.

In this study, more than 67% of participants sought health information on the internet, which is similar to recent studies reporting extensive internet use and highly prevalent OHIS [22,24,26,33]. The internet has the highest usage rate among health information sources [5-7]. The results from our study suggested that among the Chongqing population, the internet has become a major source for seeking health information, which is consistent with other reports. How to provide more high-quality health information on the web may be a key objective for public health policies and practices in Chongqing.

In this study, younger participants were more likely to seek health information on the web than older participants. Similar results were also reported in some previous studies [22,30,33,34]. IT, including health IT, is usually accessible for younger generations [35]. Therefore, younger populations may more frequently seek health information on the internet.

We also found evidence of disparities in OHIS by ethnicity in Chongqing. This result was similar to those of previous studies showing that racial or ethnic minorities were less likely to use web-based resources to seek health information [33,36,37]. A possible reason may be that differences in cultural values, care preferences, and perceived benefits of web-based health information likely contributed to these differential rates of use [36-38]. Previous research has shown that health communication in a multicultural society mainly takes the dominant culture into account, often neglecting those of nondominant groups [39-41]. In China, Han is the dominant ethnicity. This is likely secondary in part to the limited availability of web-based sources such as health-related websites and patient-provider portals in ethnic minorities other than the majority [42]. In Chongqing, the population of ethnic minorities is more than 2 million [32]. Considering the benefits of OHIS, providing web-based health information that is suitable for racial or ethnic minorities may contribute to health improvement in the multiethnic region.

Participants who lived in urban areas were more likely to use the internet to seek health information. This result corroborates previous findings that the urban population had a higher rate of OHIS [33,34,43,44]. A possible reason may be the digital divide between the urban and rural participants in this study. Although there are more than 1 billion netizens in China, people living in urban areas more easily access the internet [45]. Goldner et al [44] reported that lower internet access was associated with fewer web-based health behaviors. Therefore, eliminating the digital divide may help the rural population benefit from these resources.

In this study, a higher education level was associated with the highest odds of OHIS among the Chongqing population. This finding was in line with those of previous studies [22,27,29,30,33,34,38]. Seeking health information on the web requires not only access to technology but also the ability to retrieve, understand, and use information [46]. In addition, the vast majority of web-based patient resources contain health information that is above the reading level of most users [47,48]. Although a substantial proportion of lesser educated individuals have significant health care needs, they often encounter difficulties in finding acceptable information on the web [49]. Continued efforts to ensure that web-based health information is easy to read, understand, and retrieve are needed.

We also found that occupation was associated with the rate of OHIS behavior. In this study, participants who were medical staff or teachers were more likely to use the internet to seek health information. The reason may be that medical staff and teachers more often have higher education levels, higher socioeconomic status, and easier access to web-based resources. In addition, due to their duties, medical staff and teachers often conduct health education for patients and students, and the internet has a tremendous amount and variety of health-related information [3,4]. Therefore, they may have a higher ability and willingness to seek health information on the internet [50]. Farmers in our study were less likely to use web-based sources for seeking health information. This finding was similar to that of a previous study in Zhejiang province [29]. Farmers always live in rural areas. Due to the digital divide between urban and rural areas, farmers may have more difficulty accessing the internet [44,45].

In this study, participants reported seeking web-based health information for a broad range of health topics, including health behavior and literacy, infectious diseases, chronic disease, first aid, and health policies. Health behavior and literacy are the most common topics searched on the internet. This finding is similar to those of previous studies in which health behavior, lifestyle, and health science popularization were most commonly searched for types of web-based health information among the Chinese general or younger population [27,28]. In recent years, the Chinese government has tended to use social media to improve public health literacy and health status among Chinese citizens and has encouraged the dissemination of health science popularization information in various ways [51-53]. The increasing popularity of social media and the ever-growing number of official accounts of health science popularization might have attracted many Chinese netizens to use such information to improve their health behavior and literacy.

We found that WeChat was the most commonly used source for OHIS on the internet. A previous study reported that the number of WeChat customers has exceeded 900 million, with 150 million customers using the web for at least 2 hours every day [54]. A nationwide survey in China found that one-third of participants regularly read health information articles on WeChat, and more than 90% of the participants chose to use WeChat for health information seeking, indicating that a WeChat account is the most popular platform for acquiring health information in China [55]. However, due to growing OHIS behaviors, increasing numbers of nonauthorized social media accounts share biased or inaccurate health information; continued efforts are needed to improve the quality of health information on social media [56-58]. Improving perceived eHealth literacy among netizens and feedback-seeking behavior in digital environments would be useful to increase OHIS, and may finally help to improve public health among Chongqing Population [59,60].

This study has several limitations. First, this study was conducted in Chongqing, and the results may not be generalizable to the general population in China. Second, due to the nature of a cross-sectional survey, it is difficult to draw causal conclusions. Third, as a hot topic of OHIS in this study, failing to examine the effect of the COVID-19 on OHIS was a significant study limitation.

In summary, OHIS is prevalent in Chongqing. We found that participants who were younger, lived in an urban area, had a higher educational level, and worked as medical staff or teachers were more likely to engage in OHIS, while ethnic minorities and farmers were less likely to seek health information on the web. Among the Chongqing population, the most common topics sought on the internet were health behavior and literacy, and the most popular method of OHIS was through WeChat. According to the identified influencing factors, future research could focus on bridging the digital divide between urban and rural areas, providing higher-quality web-based health information, and examining cultural barriers to health information access among ethnic minority groups. These efforts may help to enhance Chongqing residents’ ability to obtain web-based health resources and ultimately improve public health outcomes.