Table 3.

Cox regression models of any breastfeeding duration and physical activities among Vietnamese women (N = 1715).

Physical Activity Variables	Adjusted a HR 95% CI	p-Value
Total PA (METs h/week)
1st tertile	1.00
2nd tertile	0.74 (0.60–0.92)	0.006
3rd tertile	0.59 (0.47–0.75)	<0.001
Domain of activity Household/caregiving (METs h/week)
1st tertile	1.00
2nd tertile	0.73 (0.59–0.91)	0.005
3rd tertile	0.57 (0.43–0.73)	<0.001
Occupational (METs h/week)
1st tertile	1.00
2nd tertile	0.94 (0.74–1.19)	0.627
3rd tertile	0.80 (0.62–1.03)	0.082
Sports/exercise (METs h/week)
1st tertile	1.00
2nd tertile	0.85 (0.69–1.04)	0.116
3rd tertile	0.63 (0.48–0.82)	0.001
Commuting (METs h/week)
1st tertile	1.00
2nd tertile	0.77 (0.62–0.96)	0.020
3rd tertile	0.66 (0.53–0.83)	<0.001
Intensity
Sedentary (h/week)
1st tertile	1.00
2nd tertile	1.27 (1.01–1.59)	0.042
3rd tertile	1.29 (1.01–1.64)	0.044
Light (METs h/week)
1st tertile	1.00
2nd tertile	0.96 (0.77–1.19)	0.704
3rd tertile	0.68 (0.54–0.87)	0.002
Moderate (METs h/week)
1st tertile	1.00
2nd tertile	0.67 (0.54–0.83)	<0.001
3rd tertile	0.45 (0.35–0.57)	<0.001
Vigorous (METs h/week)
Yes (MET-h/week > 0)	0.99 (0.57–1.74)	0.981
Met exercise guideline
Yes b	0.67 (0.52–0.86)	0.002
No	1.00

^a Adjusted for maternal age (<25; 25–35; >35), occupation (currently not working; currently working), education level (secondary school or lower; high school graduate; college/university or above), parity (0; 1; ≥2), pre-pregnancy body mass index (overweight; not overweight), gestational diabetes (yes; no), gestational age (preterm; not preterm), caesarean section (yes; no), low birth weight (yes; no), and admission to neonatal intensive care unit (yes; no); ^b Meeting Department of Health and Human Services guideline of > 7.5 MET h/week in sports/exercise activities of moderate-intensity or greater [4]; Abbreviations: HR, Hazard Ratio; CI, Confident Interval; MET, Metabolic Equivalent Task. Bolded p-values are significant.