Epidemiological characteristics of sleep quality and depressive mood and their correlation among electronics factory workers in Wuhan

Background The health management of professional population should cover life cycle, and employees' occupational health should not be overlooked.

Objective This study evaluates the distributions of and correlation between sleep quality and depressive mood among workers in an electronics factory in Wuhan.

Methods By a cluster sampling method, 1 500 workers from an electronics factory in Wuhan were recruited from April to July 2019, and interviewed face-to-face by trained investigators using the Pittsburgh Sleep Quality Index (PSQI) and the Self-rating Depression Scale (SDS). Comparisons of PSQI and SDS scores were made among workers grouped by selected characteristics, the correlation between PSQI and SDS scores were evaluated by Spearman's correlation test, and potential influencing factors of SDS were analyzed by multiple linear regression.

Results A total of 1 440 valid questionnaires were collected with a valid recovery rate of 96.0%. The mean PSQI score was 2.67±2.03 among the workers, and the incidence rate of sleep disorders was 4.90% (71/1 440). Among the workers grouped by gender, monthly income, passion for work, passive smoking, and physical exercise, the differences in PSQI score were statistically significant (P < 0.05). The mean SDS score was 41.30±8.46, and the incidence rate of reporting depressive mood was 15.60% (224/1 440). Among the workers grouped by gender, age, education level, monthly income, passion for work, passive smoking, and physical exercise, there were significant differences in the SDS score (P < 0.05). The total PSQI score was positively correlated with the SDS score (r=0.249, P < 0.001). The results of multiple linear regression analysis showed that higher total PSQI score (b=0.891, P < 0.001) and women (b=1.403, P=0.013) were associated with higher workers' SDS scores, and passion for work (b=-2.425, P < 0.001), higher education level (b=-2.200, P < 0.001), and regular exercise (b=-1.284, P=0.003) were associated with reduced workers' SDS score.

Conclusion The positive rates of sleep disorders and depressive mood are low among selected workers in an electronics factory in Wuhan, and there is a positive correlation between sleep disorders and depressive mood.