(a) The association between sitting time and mental health among the working population (n = 513) stratified by weight status: results of the linear regression analysis.

	Association with mental health1
	Crude		Adjusted2		Adjusted3
	Beta	95% CI	Beta	95% CI	Beta	95% CI
Healthy weight (n = 214)
Total	−0.06	−0.15; 0.03	−0.09	−0.19; 0.01	−0.10	−0.19; 0.003
Transport (h/wk)	0.03	−0.24; 0.29	−0.03	−0.32; 0.25	−0.02	−0.31; 0.27
(i) Commuting or during work (h/wk)	0.03	−0.26; 0.31	−0.06	−0.37; 0.25	−0.05	−0.36; 0.27
(ii) Leisure (h/wk)	0.10	−1.12; 1.31	0.36	−0.86; 1.58	0.36	−0.86; 1.57
At work (h/wk)	−0.07	−0.21; 0.06	−0.09	−0.25; 0.06	−0.11	−0.26; 0.04
Leisure (h/wk)	−0.10	−0.25; 0.06	−0.11	−0.26; 0.04	−0.11	−0.26; 0.04
(i) Reading (h/wk)	−0.05	−0.46; 0.36	−0.004	−0.44; 0.43	−0.02	−0.45; 0.42
(ii) TV viewing (h/wk)	−0.02	−0.29; 0.26	−0.11	−0.38; 0.17	−0.10	−0.38; 0.17
(iii) Using computer (h/wk)	−0.19	−0.63; 0.25	−0.27	−0.72; 0.18	−0.28	−0.73; 0.17
(iv) Other sitting (h/wk)	−0.45	−0.88; −0.03	−0.35	−0.77; 0.07	−0.34	−0.77; 0.08
Moderately overweight (n = 230)
Total	−0.01	−0.10; 0.08	−0.03	−0.13; 0.07	−0.03	−0.13; 0.07
Transport (h/wk)	−0.15	−0.40; 0.09	−0.20	−0.45; 0.05	−0.19	−0.44; 0.06
(i) Commuting or during work (h/wk)	−0.14	−0.40; 0.13	−0.20	−0.48; 0.07	−0.19	−0.47; 0.08
(ii) Leisure (h/wk)	−0.55	−1.48; 0.37	−0.35	−1.26; 0.56	−0.36	−1.27; 0.55
At work (h/wk)	0.10	−0.04; 0.24	0.04	−0.11; 0.19	0.04	−0.11; 0.19
Leisure (h/wk)	−0.11	−0.29; 0.06	−0.07	−0.24; 0.11	−0.06	−0.24; 0.11
(i) Reading (h/wk)	0.34	−0.19; 0.86	0.46	−0.08; 1.00	0.47	−0.07; 1.00
(ii) TV viewing (h/wk)	−0.19	−0.47; 0.10	−0.12	−0.40; 0.16	−0.11	−0.39; 0.17
(iii) Using computer (h/wk)	−0.29	−0.69; 0.12	−0.33	−0.73; 0.07	−0.32	−0.72; 0.07
(iv) Other sitting (h/wk)	−0.17	−0.63; 0.29	−0.01	−0.46; 0.43	−0.03	−0.48; 0.41
Obese (n = 69)
Total	−0.08	−0.23; 0.06	−0.07	−0.25; 0.12	−0.04	−0.24; 0.15
Transport (h/wk)	−0.20	−0.58; 0.17	−0.16	−0.60; 0.27	−0.14	−0.58; 0.30
(i) Commuting or during work (h/wk)	−0.24	−0.66; 0.18	−0.23	−0.70; 0.23	−0.21	−0.68; 0.26
(ii) Leisure (h/wk)	−0.18	−1.92; 1.56	1.01	−1.16; 3.17	1.07	−1.10; 3.23
At work (h/wk)	0.09	−0.17; 0.34	0.12	−0.22; 0.47	0.17	−0.19; 0.52
Leisure (h/wk)	−0.24	−0.48; 0.002	−0.17	−0.45; 0.11	−0.15	−0.44; 0.14
(i) Reading (h/wk)	−0.03	−0.63; 0.56	0.26	−0.46; 0.98	0.33	−0.41; 1.06
(ii) TV viewing (h/wk)	−0.50	−0.86; −0.13	−0.43	−0.84; −0.02	−0.42	−0.83; −0.01
(iii) Using computer (h/wk)	−0.09	−0.72; 0.54	−0.09	−0.75; 0.56	−0.10	0.76; 0.55
(iv) Other sitting (h/wk)	−0.13	−0.86; 0.61	0.004	−0.82; 0.83	0.12	−0.74; 0.98

¹A higher MHI score indicates better mental health; thus a negative beta indicates a negative association between sitting time and mental health; ²adjusted for gender, age, education, household composition, perceived health, physical activity, smoking, and alcohol consumption; ³additionally adjusted for BMI.