Table 2.

Pittsburgh Sleep Quality Index (PSQI) by intervention group over time.

Subscale	Total group	Baseline			Total group	2-month visit			Total group	4-month visit
		UC	PC3	p-value		UC	PC3	p-value		UC	PC3	p-value
PSQI total	9.6 ± 2.5	9.6 ± 2.6	9.6 ± 2.3	0.89	7.2 ± 2.6	7.0 ± 2.8	7.3 ± 2.5	0.40	6.2 ± 2.5	6.0 ± 2.7	6.5 ± 2.4	0.26
Sleep quality	0.61 ± 1.1	0.58 ± 1.1	0.64 ± 1.1	0.68	0.5 ± 1.0	0.5 ± 0.98	0.58 ± 1.0	0.47	0.5 ± 1.0	0.5 ± 1.0	0.5 ± 1.0	0.87
Sleep disturbance	2.0 ± 0.70	1.9 ± 0.68	2.0 ± 0.70	0.40	1.7 ± 0.61	1.6 ± 0.60	1.7 ± 0.61	0.45	1.6 ± 0.61	1.6 ± 0.62	1.6 ± 0.61	0.49
Sleep latency	1.0 ± 0.97	1.0 ± 0.94	0.9 ± 1.00	0.72	0.9 ± 0.95	0.9 ± 0.89	0.89 ± 1.0	0.87	0.8 ± 0.87	0.8 ± 0.93	0.8 ± 0.83	0.83
Sleep duration	3.0 ± 0.0	3.0 ± 0.0	3.0 ± 0.0		2.5 ± 0.58	2.5 ± 0.56	2.8 ± 0.60	0.84	1.8 ± 0.62	1.8 ± 0.66	1.8 ± 0.59	0.69
Daytime dysfunction	2.1 ± 0.79	2.1 ± 0.80	2.2 ± 0.78	0.65	1.4 ± 0.79	1.3 ± 0.83	1.4 ± 0.75	0.12	1.3 ± 0.83	1.2 ± 0.84	1.4 ± 0.81	0.17
Use of sleep medication	0.65 ± 0.96	0.64 ± 0.96	0.66 ± 0.96	0.87	0.3 ± 0.58	0.2 ± 0.64	0.3 ± 0.53	0.92	0.3 ± 0.68	0.2 ± 0.57	0.4 ± 0.75	0.05

Note: PC3 = patient-centered collaborative care; PSQI = Pittsburgh Sleep Quality Index; UC = usual care.