High job stress evaluated using the Brief Job Stress Questionnaire as an independent factor for nonrestorative sleep...

Nonrestorative sleep (NRS) is clearly more associated with objective indices than primary insomnia symptoms. Stress is a comorbid factor for NRS. In 2015, the Stress Check Program was launched in Japan as a new occupational health policy. This study aimed to clarify whether the presence or absence of high job stress (HJS), as determined by Brief Job Stress Questionnaire (BJSQ), is related to the comorbidity of NRS. The subjects were 23,813 Japanese office workers who were 20 to 59 years old. The results of the BJSQ and medical examinations from a single year were examined. Presence or absence of HJS was assessed using the BJSQ and investigated in a medical interview using a personal computer. Additionally, HJS and NRS comorbidity were analyzed to determine if there were relationships between them. The subjects had a mean age of 43.2 ± 10.7 years. The proportions of subjects with NRS and HJS were 27% and 10%, respectively. HJS was associated with a risk of NRS (odds ratio, 3.68; 95% confidence interval, 3.35-4.03; P < 0.001), after adjusting for age, gender, body mass index, life-related diseases comorbidity and cardiovascular disease comorbidity, sleep time, and lifestyle habits. HJS as measured using the BJSQ was the strongest significant comorbid factor for NRS.