[The prevalence of insufficient physical activity and the influencing factors among Chinese adults in 2018].

To understand the prevalence of insufficient physical activity among adults aged ≥18 years in China and to explore the influencing factors. The China Chronic Disease and Risk Factor Surveillance was conducted in 298 counties/districts in China in 2018, covering 31 provinces (autonomous regions, municipalities). A multi-stage stratified cluster random sampling method was used to select permanent residents aged ≥18 years. A questionnaire including Global Physical Activity Questionnaire was used to collect information about the participants' demographic characteristics and physical activity through face-to-face interview. A total of 183 769 participants completed the survey. After complex data weighting, the prevalence of insufficient physical activity, occupation, transportation, and leisure-time physical activity time was analyzed. Multivariate logistic regression models were used to analyze the influencing factors related to insufficient physical activity. The prevalence of insufficient physical activity among adults aged ≥18 years was 22.3% (95%: 20.9%-23.7%) in China in 2018, with males [24.4% (95%: 23.0%-25.8%)] significantly higher than females [20.2% (95%: 18.6%-21.8%)]. Adults aged 70 years and above [28.4% (95%: 26.9%-29.9%)] were significantly higher than adults in other age groups, followed by adults aged 18-29 years [26.4% (95%: 24.4%- 28.3%)] and 30-39 years [23.4% (95%: 21.5%-25.3%)], and tended to increase with increasing education and total sedentary behavior time (<0.001). The weekly occupation, transportation, and leisure-time physical activity time appeared 958.6 (95%: 911.4-1 005.8) minutes, 234.5 (95%: 224.7- 244.2) minutes, and 88.6 (95%: 83.5-93.7) minutes, respectively. Multivariate logistic regression analysis showed that males, adults living in rural areas or northern China, ≥70 years, with junior high school education, an annual household income per capita <6 000 yuan and institutional/clerical/ technical occupation and longer total sedentary behavior time were related to a higher prevalence of insufficient physical activity. In China, over one-fifth of the adults had lower physical activity levels. Adults who are male, young adults, more educated, institutional/clerical/technical occupation, and with more extended total sedentary behavior are the populations that need to be focused on to promote physical activity-related health.