Table 3.

Multivariate Analysis of Risk Factors of Prolonged NVP

Variables		Moderate NVP (n = 1720)			Severe NVP (n = 1007)
		OR	95% CI	P	OR	95% CI	P
Gestational age (weeks)		0.95	0.93–0.97	<0.001
Employment (housewife vs employed)		1.3	1.02–1.65	0.034	6.39	1.90–21.47	0.003
Sedentary time (hours/day)	<4	Ref	Ref	<0.001
	4 to 6	1.45	1.16–1.83	0.001
	7 to 9	1.67	1.26–2.22	<0.001
	≥10	2.02	1.16–3.53	0.013
Exercise frequency (days/week)	>6	Ref	Ref	0.007
	3 to 5	1.48	1.05–2.09	0.025
	1 to 2	1.77	1.27–2.47	0.001
	<1	1.87	1.25–2.8	0.002
	0	1.84	1.2–2.82	0.005
Cold drinking	Never				Ref		0.046
	Sometimes				0.41	0.12–1.39	0.151
	Often				0.39	0.03–4.49	0.448
	Always				11.12	1.24–100.73	0.032
History of GI diseases (yes vs no)		2.21	1.61–3.03	<0.001	10.1	2.63–38.86	0.001

Abbreviations: CI, confidence interval; GI, gastrointestinal; NVP, nausea and vomiting during pregnancy; n, number; OR, odds ratio.