Table 2.

Pittsburgh Sleep Quality Index and Insomnia Severity Index for simplified sleep restriction versus control at baseline, 3 months, and 6 months. Data presented as mean (SD)

Primary outcomes	Intervention (simplified sleep restriction)			Control			Difference between the groups (95% CI), P-value^b

	Baseline score^a n= 46	3-month score^a n= 45	6-month score^a n= 43	Baseline score^a n= 51	3-month score^a n= 49	6-month score^a n= 50
Pittsburgh Sleep Quality Index²⁵	10.43 (3.08)	6.24 (3.11)	6.49 (3.52)	10.29 (3.02)	8.71 (3.32)	8.10 (3.49)	−2.14 (−3.15 to −1.13) <0.0001
Insomnia Severity Index²⁶	14.76 (3.85)	8.47 (4.45)	8.28 (4.41)	14.51 (3.36)	11.51 (3.94)	10.50 (3.72)	−2.50 (−3.97 to −1.03) 0.001

Statistically significant results are in bold.
↵a Observed (raw) data.
↵b Mixed model for repeated measures adjusted for age, sex, and baseline insomnia severity (using ISI score).