Table 2. Predictors of Changes of HbA1c in Multivariate Hierarchical Analysis^a.

Variables	Model 1	Model 2	Model 3
	B (SE), P Value	B (SE), P Value	B (SE), P Value
Chronotype
Morning (Ref.)	-	-	-
Intermediate	0.59 (0.28), 0.036b	0.47 (0.28), 0.096	0.13 (0.28), 0.644
Evening	1.82 (0.26), < 0.001b	1.62 (0.26), < 0.001b	0.68 (0.33), 0.040b
Body mass index	-	0.08 (0.04), 0.016b	0.07 (0.03), 0.044b
Age	-	0.05 (0.03), 0.139	0.04 (0.03), 0.171
Sex (ref: male)	-	0.35 (0.23), 0.143	0.26 (0.23), 0.277
Time of going to bed	-	-	0.51 (0.11), < 0.001b
Duration of sleep	-	-	0.17 (0.09), 0.079
Insomnia score, %	-	-	0.01 (0.03), 0.619
R2	28.4	33.2	44.1
R2 change	Ref.	4.8	10.9
P value of model	< 0.001b	0.027b	< 0.001b

^aModel 1, chronotype entered in analysis; model 2, model 1 plus baseline characteristics (age, sex and BMI); model 3: model 2 plus sleep-related variables (time of going to bed, sleep duration, and insomnia score).

^bSignificant difference