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Table 1 Maternal and child characteristics of responders, non-responders and eligible participants

From: Maternal recall of breastfeeding duration twenty years after delivery

Variables Respondersa (n=374) Non-respondersb (n=263) P-valuec Eligible participants (n=981)
Maternal characteristics d
Age at delivery, yrs, mean (SD) 29.1 (3.9) 28.7 (4.4) 0.327 29.1 (4.1)
Pre-pregnancy BMI, kg/m2, mean (SD) 21.2 (2.8) 21.2 (2.9) 0.949 21.1 (2.9)
College/ university education, n (%) 44 (26.5) 48 (18.3) 0.001 240 (24.5)
Never smokers, n (%) 108 (28.9) 42 (16.0) <0.001 254 (25.9)
Married/cohabitinge, n (%) 330 (88.2) 224 (85.2) 0.076 856 (87.3)
No breastfeedingf, n (%) 0 1 (0.4)   1 (0.001)
Breastfeeding durationf , months, median (IQR) 6.0 (6.0) 5.0 (5.0) <0.001 6.0 (5.8)
Child characteristics, index pregnancy d
Birth weight, g, mean (SD) 3440.7 (611.3) 3382.1 (595.4) 0.229 3424.1 (625.2)
Preterm birth of child, n (%) 15 (4.0) 14 (5.4) 0.434 62 (6.3)
SGAg, n (%) 64 (17.1) 52 (19.8) 0. 406 132 (13.6)
Gender,     
 Boy, n (%) 167 (44.7) 140 (53.2) 0.033 490 (49.9)
 Girl, n (%) 207 (55.3) 123 (46.8)   491 (50.1)
Birth order of index child,     
 2nd birth, n (%) 282 (75.4) 191 (72.6) 0.462 704 (71.8)
 3rd birth, n (%) 92 (24.6) 72 (27.4)   277 (28.2)
Age at introduction of cereals, months, median (IQR)h 4.0 (1.0) 4.0 (1.0) 0.140 4.0 (1.0)
Age at introduction of another kind of milk, months, median (IQR)i 5.0 (4.5) 2.5 (5.0) <0.001 4.0 (4.8)
  1. Abbreviations’: SD, standard deviation; BMI, body mass index; IQR, interquartile range; SGA, small for gestational age.
  2. a Responders with complete recorded breastfeeding data.
  3. b Non-responders with complete recorded breastfeeding data.
  4. c P-value assessed using Chi-square test (categorical data) and independent samples t-test or the non-parametric Mann Whitney test (continuous data).
  5. d Background variables reported in parent study. Continuous variables presented as mean (SD) or median (IQR), categorical variables presented as n (%).
  6. e Number of women with unknown marital status: among responders: 39, among non-responders: 28
  7. f Number of women still breastfeeding at 13 months and therefore excluded in analysis of this variable: among responders: 29, among non-responders: 1. Number of missing data among eligible participants: 351.
  8. gSGA defined as birth weight <10 percentile for gestational age, gender and parity [20]
  9. h Numbers with missing data on infant’s age at introduction of cereals: among responders: n=16, among non-responders: n=15. Number of missing data among eligible participants: 229.
  10. i Numbers with missing data on infant’s age at introduction of another kind of milk: among responders: n=36, among non-responders: n=19. Number of missing data among eligible participants: 261.