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Table 4 Breastfeeding duration in months

From: Factors associated with duration of breastfeeding in Spain: a cohort study

Factor Mean (95% CI) Median (95% CI)
Maternal age (selected ages)
 20 years 5.05 (4.09–6.00) 2.63 (1.97–3.29)
 25 years 5.37 (4.72–6.03) 2.90 (2.38–3.41)
 30 years 5.70 (5.29–6.11) 3.18 (2.80–3.56)
 35 years 6.03 (5.69–6.36) 3.50 (3.15–3.85)
Maternal educational level
 Primary studies (ref.) 5.03 (4.30, 5.77) 2.78 (2.22, 3.33)
 Secondary studies 5.82 (4.87, 6.76) 3.57 (2.67, 4.46)
 Foundation degree 4.95 (4.34, 5.56) 2.74 (2.29, 3.20)
 University studies 7.27 (6.72, 7.81) 4.28 (3.66, 4.90)
Smoking in pregnancy
 No (ref.) 6.21 (5.86, 6.56) 3.62 (3.25, 3.99)
 Yes 4.15 (3.23, 5.08) 2.14 (1.61, 2.66)
Duration of pregnancy
  ≥ 37 weeks (ref.) 5.97 (5.62, 6.31) 3.46 (3.10, 3.81)
 34–36 weeks 5.91 (4.26, 7.56) 3.37 (1.88, 4.85)
  < 34 weeks 4.96 (2.38, 7.54) 3.13 (1.01, 5.25)
Twin pregnancy
 No (ref.) 6.02 (5.69, 6.36) 3.51 (3.15, 3.87)
 Yes 4.16 (2.51, 5.80) 2.00 (1.13, 2.87)
Newborn weight
  < 2500 g 5.01 (3.71, 6.30) 2.68 (1.74, 3.63)
 2500, 4000 g 6.00 (5.63, 6.36) 3.49 (3.11, 3.86)
  > 4000 g 6.49 (5.30, 7.67) 3.77 (2.61, 4.92)
  1. Note: Medians and means adjusted for the maternal age and the remaining variables in the table. Only variables in the multivariate analysis of Table 3 are included