Figure 3

Change in primary and secondary outcomes, by intervention group. (A) Sleep efficiency. (B) PSQI score. (C) Wake-after sleep onset. (D) Total sleep time. (E) SF-36 subdomain 8: “General Health”. (F) Salivary cortisol. The p value represents the statistical significance of the between-groups difference in the final-basal change in each variable. PSQI Pittsburgh sleep quality index, SF-36 36-item health survey questionnaire.