Table 2.

Multivariate adjusted OR (95% CI) of diabetes and sleep quality or sleep duration

Sleep	Model 1	Model 2	Model 3
	OR (95% CI)	OR (95% CI)	OR (95% CI)
Difficulty
Good	1	1	1
Common	1.26 (0.98 to 1.62)	1.21 (0.95 to 1.59)	1.19 (0.94 to 1.50)
Poor	2.12 (1.46 to 3.08)	1.81 (1.21 to 2.70)	1.76 (1.14 to 2.71)
Duration
6–8 h	1	1
≥8 h	1.06 (0.90 to 1.25)	1.01 (0.88 to 1.15)	0.87 (0.71 to 1.11)
≤6 h	1.43 (1.15 to 1.77)	1.31 (1.09 to 1.71)	1.25 (1.03 to 1.51)

Model 1, adjusted for age, sex, education, occupation and BMI. Model 2, adjusted for age, sex, education, occupation, BMI, family history of diabetes, smoking status, alcohol consumption and hypertension. The interaction between sleep quality and sleep duration was not statistically significant. Thus these two variables were entered into the model separately, except for model 3, in which the results were adjusted for each other.