Table 2 Linear regression model of anthropometric data, body fat percentage, and fat mass index with night and daytime sleep hour duration as continuous variables in both gender.

From: Sleep duration and anthropometric indices in an Iranian population: the Fasa PERSIAN cohort study

Dependent variable	Independent variable	Male				Female
Dependent variable	Independent variable	B	SE (B)	Beta	p-value	B	SE (B)	Beta	p-value
BMI (kg/m²)	(Constant)	25.093	0.284		< 0.001	27.298	0.292		< 0.001
	Night sleep	− 0.003	0.001	− 0.074	< 0.001	− 0.002	0.001	− 0.043	0.001
	Daytime sleep	0.009	0.001	0.111	< 0.001	0.010	0.001	0.108	< 0.001
WC (cm)	(Constant)	91.008	0.721		< 0.001	98.293	0.698		< 0.001
	Night sleep	− 0.007	0.002	− 0.057	< 0.001	− 0.007	0.002	− 0.057	< 0.001
	Daytime sleep	0.023	0.003	0.111	< 0.001	0.016	0.003	0.072	< 0.001
HC (cm)	(Constant)	98.817	0.494		< 0.001	101.728	0.572		< 0.001
	Night sleep	− 0.005	0.001	− 0.066	< 0.001	− 0.003	0.001	− 0.032	0.018
	Daytime sleep	0.015	0.002	0.111	< 0.001	0.018	0.002	0.098	< 0.001
WrC (cm)	(Constant)	17.532	0.080		< 0.001	16.264	0.077		< 0.001
	Night sleep	− 0.001	0.000	− 0.068	< 0.001	0.000	0.000	− 0.015	0.251
	Daytime sleep	0.002	0.000	0.083	< 0.001	0.002	0.000	0.082	< 0.001
WHR	(Constant)	0.919	0.004		< 0.001	0.966	0.004		< 0.001
	Night sleep	0.000	0.000	− 0.027	0.068	0.000	0.000	− 0.060	< 0.001
	Daytime sleep	0.000	0.000	0.071	< 0.001	0.000	0.000	− 0.008	0.571
WHtR	(Constant)	0.539	0.004		< 0.001	0.636	0.005		< 0.001
	Night sleep	0.000	0.000	− 0.056	< 0.001	− 0.000	0.000	− 0.067	< 0.001
	Daytime sleep	0.000	0.000	0.099	< 0.001	0.000	0.000	0.061	< 0.001
Body fat (%)	(Constant)	51.589	0.843		< 0.001	48.371	0.760		< 0.001
	Night sleep	− 0.005	0.002	− 0.051	0.018	− 0.001	0.002	− 0.010	0.603
	Day sleep	0.010	0.003	0.059	0.005	0.011	0.003	0.068	0.001
FMI (kg/m²)	(Constant)	6.699	0.303		< 0.001	8.347	0.334		< 0.001
	Night sleep	0.000	0.001	− 0.009	0.675	− 0.001	0.001	− 0.020	0.326
	Daytime sleep	− 0.002	0.001	− 0.028	0.196	0.001	0.001	0.017	0.413

Beta: Standardized regression coefficients (calculated as b_i × S_Xi/S_Y). BMI body mass index, WC waist circumferences, HC hip circumferences, WrC wrist circumferences, WHR waist to hip ratio, WHtR waist to height ratio, FMI fat mass index.
Bold values are less than 0.05 and are statistically significant.

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Table 2 Linear regression model of anthropometric data, body fat percentage, and fat mass index with night and daytime sleep hour duration as continuous variables in both gender.

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