Supplementary Table 1.

Stepwise multinomial logistic regression of potentially significant predictors of RTL including body mass index as a marker for obesity with RTL

	RTL
	≤1.060		1.060 - 1.432		>1.432
Variables	OR (95 % CI )	P-value	OR (95 % CI)	P-value
Age - 40-60 years	2.41 (1.45 - 4.02)	0.001	1.35 (0.84 - 2.19)	0.22	Reference
Age - >60 years	2.12 (1.06 - 4.23)	0.03	1.25 (0.63 - 2.48)	0.52	Reference
Education - Intermediate school	0.49 (0.27 - 0.88)	0.02	1.19 (0.68 - 2.06)	0.54	Reference
Education - Secondary school or technical diploma	0.88 (0.49 - 1.58)	0.67	1.00 (0.55 - 1.82)	1.00	Reference
Education - University degree	0.96 (0.45 - 2.06)	0.91	0.90 (0.40 - 2.01)	0.80	Reference
Any sleeping difficulty - Rarely, sometimes, or frequently	2.04 (1.13 - 3.69)	0.02	1.04 (0.58 - 1.88)	0.89	Reference
Any sleeping difficulty - Almost always	1.61 (0.90 - 2.86)	0.11	1.49 (0.87 - 2.55)	0.15	Reference

Age (reference: <40); Education (reference: No schooling/primary school); Body mass index -BMI (per unit increase of 1); Any sleeping Difficulty (reference: Never). Waist Circumference (WC) was not included due to collinearity with BMI.