Table 4. Relationships between total sleep duration, daytime napping and eGFR.

	CKD risk for subjects with eGFR<90		Hyperfiltration risk for subjects with eGFR> = 90
	OR for CKD	P value	OR for hyperfiltration	P value
Model 1
Total sleep duration,h
(0, 6)	1.188(0.720, 1.963)	0.500	1.302(0.802, 2.116)	0.286
[6, 7)	0.910(0.681, 1.214)	0.520	1.036(0.792, 1.357)	0.794
[7, 8]	1		1
(8, 9]	1.152(0.971, 1.368)	0.105	1.325(1.123, 1.562)	0.001
>9	1.549(1.286, 1.866)	<0.001	1.689(1.397, 2.042)	<0.001
Daytime napping,h
0	1		1
(0, 1]	1.029(0.873, 1.212)	0.736	1.324(1.128, 1.554)	0.001
(1, 1.5]	1.481(1.132, 1.937)	0.004	1.794(1.381, 2.330)	<0.001
>1.5	1.294(0.931, 1.800)	0.125	1.712(1.265, 2.317)	<0.001
Model 2
Total sleep duration,h
(0, 6)	1.053(0.633, 1.752)	0.843	1.336(0.820, 2.176)	0.245
[6, 7)	0.863(0.644, 1.156)	0.322	1.037(0.791, 1.360)	0.791
[7, 8]	1		1
(8, 9]	1.006(0.844, 1.198)	0.950	1.326(1.123, 1.565)	0.001
>9	1.208(0.997, 1.464)	0.053	1.688(1.394, 2.044)	<0.001
Daytime napping,h
0			1
(0, 1]	0.860(0.727, 1.017)	0.077	1.345(1.144, 1.581)	<0.001
(1, 1.5]	1.212(0.921, 1.594)	0.170	1.793(1.377, 2.334)	<0.001
>1.5	1.064(0.761, 1.488)	0.718	1.736(1.279, 2.357)	<0.001
Model 3
Total sleep duration,h
(0, 6)	1.062(0.635, 1.777)	0.818	1.261(0.729, 2.179)	0.407
[6, 7)	0.906(0.676, 1.216)	0.512	1.076(0.797, 1.453)	0.633
[7, 8]	1		1
(8, 9]	1.005(0.842, 1.200)	0.957	1.168(0.966, 1.411)	0.109
>9	1.150(0.945, 1.401)	0.163	1.400(1.123, 1.745)	0.003
Daytime napping,h
0	1		1
(0, 1]	0.813(0.685, 0.965)	0.018	0.874(0.726, 1.051)	0.153
(1, 1.5]	1.140(0.860, 1.510)	0.363	1.285(0.943, 1.750)	0.112
>1.5	0.955(0.678, 1.347)	0.795	1.191(0.836, 1.699)	0.333

Model 1 was unadjusted. Model 2 was adjusted for age, sex and BMI. Model 3 was adjusted for covariates in model 2 plus hip and waist circumference, drinking and smoking habits, physical exercise, triglycerides, cholesterol, HDL, LDL, GGT, blood glucose and blood pressure.