Table 3.

Crude and adjusted prevalence ratios for exclusive breastfeeding at least 8 weeks, Hawaii Pregnancy Risk Assessment Monitoring System (PRAMS), 2004–2008

	Crude PR	(95 % CI)a	Adjusted PRb	(95 % CI)
Maternal race
White	Ref		Ref
Native Hawaiian	0.61	(0.57–0.66)	0.67	(0.61–0.72)
Samoan	0.47	(0.37–0.59)	0.54	(0.43–0.69)
Filipino	0.56	(0.51–0.61)	0.58	(0.53–0.63)
Japanese	0.57	(0.51–0.63)	0.58	(0.52–0.65)
Chinese	0.65	(0.59–0.71)	0.64	(0.58–0.70)
Korean	0.73	(0.65–0.82)	0.72	(0.64–0.82)
Black	0.71	(0.58–0.87)	0.79	(0.65–0.96)
Other/unknown	0.80	(0.73–0.88)	0.86	(0.78–0.95)
Maternal age
<20 years	0.87	(0.57–0.66)	0.89	(0.79–1.01)
20–24	0.87	(0.37–0.59)	0.85	(0.79–0.92)
25–34	Ref		Ref
35 or more	0.93	(0.86–1.00)	0.95	(0.89–1.03)
Pre-pregnancy weight status
Underweight (BMI < 18.5)	0.98	(0.88–1.10)	0.98	(0.87–1.10)
Normal	Ref		Ref
Overweight (BMI 25–29.9)	0.85	(0.79–0.92)	0.88	(0.82–0.95)
Obese (BMI ≥ 30)	0.74	(0.67–0.82)	0.77	(0.70–0.85)
Mode of delivery
Cesarean	0.79	(0.73–0.85)	0.79	(0.73–0.85)
Vaginal	Ref		Ref
Return to work/school
Yes	0.80	(0.76–0.85)	0.85	(0.80–0.90)
No	Ref		Ref
Self-reported postpartum depressive symptoms
Yes	0.80	(0.73–0.88)	0.84	(0.76–0.92)
No	Ref		Ref

^a95 % CI refers to the 95 % Confidence Interval

^bFinal model adjusted for all other variables listed