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Table 3 Logistic Regression associations of characteristics with breastfeeding outcomes

From: Factors associated with duration of breastfeeding in women giving birth for the first time

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
  1. 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
  2. Model Area Under the Curve (AUC) reported as AUC (95% confidence interval)
  3. C Variables obtained from chart abstraction, FPL Federal poverty level, STAI-T Spielberger State-Trait Anxiety Inventory, ICC Intra-class correlation