Abbreviations: p : p -values (2-tailed); N: sample size; SD:
standard deviation; ISI: Insomnia Severity Index, GAD-7: Generalized
Anxiety Disorder 7 scale; PHQ-9: Patient Health Questionnaire 9 scale;
WHO-5: Well-being questionnaire of the World Health Organization (WHO).
Table 2. Measures of psychological health by gender and time
point (matched sample).