Figure 1.

Changes in the CPAP+ and CPAP− groups from the end of the RCT to follow-up on the depression, daytime sleepiness and sleep quality scales. CSD: Although neither group had depressive symptoms at the end of the RCT, at follow-up, the CPAP+ group continued having no depressive symptoms (CSD < 6) (effect size = 1.3) while the CPAP− group showed an increase in CSD scores suggesting deterioration in mood (CSD > 6); ESS: Neither group had evidence of daytime somnolence at the end of the RCT; however, at follow-up, the CPAP+ group's ESS result was unchanged while the CPAP− group's ESS score was consistent with clinically significant daytime sleepiness (effect size = 0.8); PSQI: CPAP+ group showed a significant clinical and statistical improvement in PSQI while the CPAP− group showed a clinical and statistical deterioration (effect size = 1.8, p < 0.05 by both Student's t-test and Mann-Whitney test).