. Author manuscript; available in PMC: 2013 Aug 29.

Published in final edited form as: Asian Biomed (Res Rev News). 2009 Jun;3(3):267–277.

Table 3.

Adjusted Odds Ratios (OR) and 95% Confidence Intervals (95% CI) for Preterm Delivery Subtypes According to Occupational and Leisure Time Physical Activity Performed Before and/or During Pregnancy, Bangkok, Thailand, 2006–2007.

Measurement	Term Controls (n = 467)	Spontaneous Preterm Delivery (n = 230)			Preterm Premature Rupture of Membrane (n = 120)			Medically Indicated Preterm Delivery (n = 117)
Measurement	n^a	n^a	OR^b	[95% CI]	n^a	OR^b	[95% CI]	n^a	OR^b	[95% CI]
Occupational physical exertion during pregnancy^c
Light exertion	145	62	1.00	Reference	39	1.00	Reference	48	1.00	Reference
Medium exertion	133	55	0.94	[0.60, 1.48]	40	1.12	[0.66, 1.89]	26	0.60	[0.34, 1.06]
Heavy exertion	11	10	2.07	[0.81, 5.28]	3	0.86	[0.22, 3.27]	13	3.79	[1.54, 9.32]
Leisure-time physical activity before pregnancy
No	277	152	1.00	Reference	76	1.00	Reference	77	1.00	Reference
Yes	180	73	0.70	[0.49, 1.00]	41	0.79	[0.51, 1.23]	39	0.86	[0.55, 1.36]
Leisure-time physical activity during pregnancy
No	371	183	1.00	Reference	95	1.00	Reference	94	1.00	Reference
Yes	80	41	0.94	[0.61, 1.46]	21	1.04	[0.60, 1.79]	20	0.86	[0.48, 1.54]
Leisure-time physical activity
Inactive both before and during pregnancy	272	143	1.00	Reference	74	1.00	Reference	75	1.00	Reference
Active only during pregnancy	5	6	1.55	[0.44, 5.49]	2	1.43	[0.26, 7.72]	1	-
Active only before pregnancy	98	35	0.65	[0.41, 1.03]	20	0.70	[0.40, 1.24]	18	0.81	[0.45, 1.47]
Active both before and during pregnancy	75	35	0.82	[0.51, 1.31]	18	0.88	[0.49, 1.59]	19	0.88	[0.48, 1.61]

Number may not be added up to the total number due to missing data

Adjusted for maternal age, pre-pregnancy body mass index, and parity

Analysis were restricted to women who were employed during pregnancy