Association of napping and night-time sleep with impaired glucose regulation, insulin resistance and glycated haemoglobin in Chinese middle-aged adults with no diabetes: a cross-sectional study.

Compared with the reference group, the crude ORs for IGR did not reach statistical significance, but the adjusted ORs showed that participants with shorter night-time sleep (<6 h) were less likely to have IGR, where OR=0.77 (p=0.042) when adjusted for age, gender and napping, and OR=0.74 (p=0.020) when further adjusted for other variables selected by the forward conditional method (hypertension, FDH, dyslipidaemia, smoking status, alcohol status, snoring, education level, BMI and WHR).

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