Table 3.

Logistic Regression associations of characteristics with breastfeeding outcomes

Variable	Did you ever breastfeed this baby Yes Vs No (reference group) N = 5249 Yes = 4712 No = 537			How old was this baby when all breastfeeding stopped? > 6 months Vs < = 6 months (reference) N = 4704 > 6 m = 2739 < =6 m = 1965			How old was this baby when exclusive breastfeeding stopped? > 6 months Vs <= 6 months (reference) N = 3726 > 6 m = 1161 < =6 m = 2565
	Model AUC = 0.79 (0.76–0.81), N = 5249			Model AUC = 0.71 (0.69–0.72), N = 4704			Model AUC = 0.59 (0.57–0.61), N = 3726
	OR1	95% CI	P-value	OR1	95% CI	P-value	OR1	95% CI	P-value
Agev1	1.01	0.99–1.04	0.32	1.02	1.01–1.04	0.01	1.03	1.01–1.05	0.002
BMIv1	0.95	0.94–0.97	< 0.001	0.96	0.95–0.97	< 0.001	0.98	0.96–0.99	< 0.001
Gestational age at deliveryc	1.10	1.05–1.15	< 0.001	1.05	1.01–1.09	0.01	1.00	0.97–1.04	0.90
Race or Ethnicityv1
Non-Hispanic white	Reference			Reference			Reference
Non-Hispanic black	0.68	0.51–0.90	0.01	0.92	0.71–1.19	0.51	1.23	0.90–1.67	0.19
Hispanic	1.40	1.02–1.92	0.04	0.72	0.59–0.88	0.002	1.13	0.89–1.44	0.31
Other	1.30	0.87–1.95	0.20	0.86	0.69–1.09	0.21	0.99	0.77–1.28	0.94
Povertyv1
> 200% of FPL	1.59	1.12–2.27	0.01	1.11	0.86–1.43	0.42	1.22	0.89–1.68	0.22
100–200% of FPL	1.47	1.03–2.10	0.03	1.09	0.83–1.43	0.55	1.52	1.08–2.13	0.02
< 100% of FPL	Reference			Reference			Reference
Refused	0.85	0.62–1.14	0.27	0.65	0.49–0.86	0.003	0.88	0.62–1.26	0.49
Educationv1
Master’s degree and higher	2.81	1.90–4.14	< 0.001	1.89	1.51–2.36	< 0.001	1.08	0.84–1.40	0.53
Bachelor degree or less	2.12	1.62–2.76	< 0.001	1.43	1.20–1.70	< 0.001	1.05	0.85–1.30	0.66
High school or less	Reference			Reference			Reference
Planned pregnancyv1
Yes	1.09	0.86–1.37	0.48	1.48	1.27–1.73	< 0.001	1.18	0.98–1.42	0.08
No		Reference			Reference			Reference
Delivery by cesarean
Yes	0.93	0.75–1.17	0.55	0.88	0.76–1.02	0.10	1.10	0.93–1.30	0.28
No		Reference			Reference			Reference
Did you smoke any tobacco products in the month before delivery?v4
Yes		Reference			Reference			Reference
No	2.32	1.56–3.45	< 0.001	2.04	1.19–3.45	0.01	3.12	1.43–7.14	0.01
STAI-Tv1	0.985	0.975–0.996	0.01	0.990	0.983–0.998	0.01	0.997	0.988–1.006	0.47
Random effect Estimate (SE)	0.121 (0.07)			0.074 (0.04)			0.006 (0.01)
ICC	0.04			0.02			0.002

V1 (gestational age 6 weeks 0 days to 13 weeks 6 days), V2 (gestational age 16 weeks 0 days to 21 weeks 6 days), V3 (gestational age 22 weeks 0 days to 29 weeks 6 days), V4 (at time of delivery) – Variables obtained at Visits 1, 2, 3, 4 respectively

Model Area Under the Curve (AUC) reported as AUC (95% confidence interval)

C Variables obtained from chart abstraction, FPL Federal poverty level, STAI-T Spielberger State-Trait Anxiety Inventory, ICC Intra-class correlation