Sedentary bout durations and metabolic syndrome among working adults: a prospective cohort study

BMC Public Health

Table 2 Multivariable-adjusted hazard ratios (95 % confidence intervals) for the development of metabolic syndrome, the Ryobi Health Survey 2009 – 2010 (n = 430)

	Cases (n)	Incident rate (per 1000 person-years)	Model 1			Model 2			Model 3			Model 4
	Cases (n)	Incident rate (per 1000 person-years)	HR	95 % CI	p value	HR	95 % CI	p value	HR	95 % CI	p value	HR	95 % CI	p value
Total sedentary time (≥1-min bout)
Q1	22	62.5	1.00			1.00			1.00			1.00
Q2	23	68.0	1.23	(0.63 – 2.39)	0.542	1.39	(0.67 – 2.86)	0.376	1.37	(0.66 – 2.82)	0.398	1.50	(0.73 – 3.09)	0.272
Q3	20	63.3	1.66	(0.88 – 3.13)	0.116	1.87	(0.94 – 3.72)	0.075	1.84	(0.92 – 3.68)	0.083	1.76	(0.87 – 3.55)	0.118
Q4	18	56.6	1.12	(0.56 – 2.21)	0.752	1.30	(0.61 – 2.76)	0.500	1.26	(0.59 – 2.69)	0.559	1.55	(0.70 – 3.43)	0.278
Non-prolonged sedentary time (<30-min bout)
Q1	16	52.6	1.00			1.00			1.00			1.00
Q2	18	55.9	0.71	(0.38 – 1.31)	0.268	0.72	(0.39 – 1.34)	0.298	0.71	(0.38 – 1.33)	0.287	0.79	(0.42 – 1.48)	0.465
Q3	27	81.3	0.82	(0.45 – 1.48)	0.500	0.82	(0.45 – 1.51)	0.520	0.81	(0.44 – 1.49)	0.491	1.09	(0.59 – 2.03)	0.785
Q4	22	60.1	0.85	(0.47 – 1.52)	0.573	0.85	(0.47 – 1.56)	0.606	0.83	(0.45 – 1.52)	0.546	1.08	(0.57 – 2.02)	0.817
Prolonged sedentary time (≥30-min bout)
Q1	20	58.3	1.00			1.00			1.00			1.00
Q2	23	70.6	2.58	(1.24 – 5.37)	0.011	2.71	(1.29 – 5.68)	0.009	2.72	(1.30 – 5.73)	0.008	3.03	(1.42 – 6.49)	0.004
Q3	21	64.4	2.16	(1.02 – 4.59)	0.045	2.41	(1.11 – 5.25)	0.026	2.42	(1.11 – 5.25)	0.026	2.25	(1.03 – 4.92)	0.040
Q4	19	57.8	2.49	(1.18 – 5.24)	0.017	2.86	(1.31 – 6.21)	0.008	2.85	(1.31 – 6.18)	0.008	2.90	(1.30 – 6.44)	0.009

HR hazard ratio, CI confidence interval. Sedentary variables were adjusted for time spent wearing the device using the residual method prior to classifying into sex-specific quartiles. Model 1 was adjusted for sex and age. Model 2 was adjusted for sex, age, education, smoking, and family income. Model 3 was additionally adjusted for moderate-to-vigorous physical activity. Model 4 was additionally adjusted for waist circumference. Cut-offs for quartiles were 106.7, 165.5, and 269.2 min/day for men, and 65.1, 122.7, and 195.4 for women among those who wore the accelerometer device for the average amount of wear-time

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