Effectiveness of cognitive behavior therapy for sleep disturbance and glycemic control in persons with type 2 diabetes mellitus: A community-based randomized controlled trial in China

Table 1 Comparison of cluster levels between the intervention and control groups at baseline, 6 mo, and 12 mo

Variable	Baseline				2 mo					6 mo				12 mo
	CBT	Control	χ2/t value	P value		CBT	Control	χ2/t value	P value	CBT	Control	χ2/t value	P value	CBT	Control	χ2/t value	P value
Cluster level (group)
Number of groups	22	22	---	---		22	22	---	---	22	22	---	---	22	22	---	---
Number of participants
10	6	10	1.62	0.45		7	11	1.58	0.45	13	14	1.348	0.51	18	20	0.77	0.38
20	10	7				9	6			7	5			4	2
30	6	5				6	5			1	3			0	0
Number of follow-up general practitioners in each community
≤ 5	6	7	0.55	0.76		6	7	0.55	0.76	6	7	0.553	0.758	6	7	0.55	0.76
6-10	15	13				15	13			15	13			15	13
10-15	1	2				1	2			1	2			1	2

CBT: Cognitive behavioral therapy.