Study on insomnia and sleep quality in adolescents and their correlation analysis

Objective To investigate the correlation between insomnia and sleep quality in adolescents. Methods According to Insomnia Severity Index (ISI) Chinese Version, 3342 students technician training in school were divided into non insomnia group (N = 2345) and insomnia group (N = 997). Sleep and emotional state were assessed by ISI Chinese Version, Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), Self?Rating Anxiety Scale (SAS) and Beck Depression Inventory (BDI). The social demographic data were collected simultaneously.  Results The number of insomnia, daytime sleepiness, anxiety and depression in the population was 997 (29.83%), 568 (17.00%), 243 (7.27%) and 1287 (38.51%), respectively. The comparison of social demographic data between 2 groups showed that the proportion of female ( P = 0.000), poor physical condition ( P = 0.000), non?only child ( P = 0.006), high learning pressure ( P = 0.000) and smoking ( P = 0.027) in insomnia group were significantly higher than those in non insomnia group. The total scores of ISI Chinese Version ( P = 0.000), ESS ( P = 0.000), SAS ( P = 0.000) and BDI ( P = 0.000) in insomnia group were significantly higher than those in non insomnia group. Pearson correlation analysis showed that ISI Chinese Version and PSQI scores were positively correlated with ESS score ( r = 0.361, P = 0.000; r = 0.064, P = 0.000), SAS score ( r = 0.326, P = 0.000; r = 0.069, P = 0.000) and BDI score ( r = 0.529, P = 0.000; r = 0.067, P = 0.000), and ISI Chinese Version had higher correlation ( r = 0.300-0.600) with the above scores than PSQI ( r < 0.100). Further partial correlation analysis showed that ISI Chinese Version score was negatively correlated with PSQI score ( r = ? 0.056, P = 0.001). Conclusions Higher proportion of female, worse physical condition, more non?only child, greater learning pressure and higher smoking rate were observed in insomnia group. Daytime sleepiness, anxiety and depression in insomnia group were more serious than those in non insomnia group, but PSQI score can not distinguish the above differences. Compared with PSQI, ISI Chinese Version is more closely related to daytime sleepiness, anxiety and depression, and might be more suitable for assessing insomnia in adolescents. DOI: 10.3969/j.issn.1672-6731.2017.09.007