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Table 2 Recall error of breastfeeding duration by maternal and child characteristics (n=345)

From: Maternal recall of breastfeeding duration twenty years after delivery

   Breastfeeding duration Recall error  
  n Recorded Median (IQR) Recalled Median (IQR) Underreporting > one month % (95%CI) Overreporting > one month % (95%CI) ICC
Maternal characteristics
Age at delivery (yrs)  
 <25 46 3.0 (5.8) 4.0 (6.0) 10.9 (3.6, 23.6) 28.3 (16.0, 43.5) 0.76
 25-<30 184 6.0 (5.0) 7.0 (5.0) 6.0 (3.0, 10.4) 29.4 (22.9, 36.5) 0.81
 ≥30 115 7.0 (5.0) 7.5 (5.0) 11.3 (6.2, 18.9) 24.4 (16.8, 33.2) 0.85
Pre-pregnancy BMI (kg/m2)a  
 <25 314 6.0 (6.0) 7.0 (5.0) 8.3 (5.5, 11.9) 28.7 (23.7, 34.0) 0.81
 ≥25 30 3.5 (6.6) 4.5 (7.0) 10.0 (2.1, 26.5) 13.3 (3.8, 30.7) 0.93
Educational level  
 Primary school 42 3.5 (6.3) 5.0 (5.0) 7.1 (1.5, 19.5) 33.3 (19.6, 49.6) 0.87
 Secondary school 187 6.0 (5.0) 6.0 (5.0) 8.6 (5.0, 13.5) 28.3 (22.0, 35.4) 0.78
 College/university 84 8.0 (4.0) 9.0 (4.0) 8.3 (3.4, 16.4) 22.6 (14.2, 33.1) 0.87
 Missing information 32 8.0 (3.0) 8.5 (4.75) 9.4 (2.0, 25.0) 28.1 (13.8, 46.8) 0.74
Smoking status  
 Never 90 8.0 (4.0) 9.0 (4.0) 8.9 (3.9, 16.8) 24.4 (16.0, 34.6) 0.82
 Ever 255 6.0 (5.5) 6.0 (6.0) 8.2 (5.2, 12.3) 28.6 (23.2, 34.6) 0.81
Child characteristics, index pregnancy
Birth weight (g)  
 <3500 177 7.0 (6.0) 7.5 (5.0) 9.6 (5.7, 14.9) 28.8 (22.3, 36.1) 0.82
 ≥3500 168 6.0 (5.0) 7.0 (5.0) 7.1 (3.8, 12.1) 26.2 (19.7, 33.5) 0.83
Preterm birth of child  
 Yes 11 8.0 (3.0) 10.0 (5.0) n.c.b 4.5 (16.8, 76.6) 0.71
 No 334 6.0 (6.0) 7.0 (5.0) 8.7 (5.9, 12.2) 27.0 (22.3, 32.1) 0.83
SGAc  
 Yes 56 7.0 (5.0) 8.0 (5.5) 5.4 (11.2, 14.9) 39.3 (26.5, 53.3) 0.82
 No 289 6.0 (6.0) 7.0 (5.0) 9.0 (6.0, 12.9) 25.3 (20.4, 30.7) 0.83
Gender,  
 Male 156 6.0 (5.9) 7.5 (5.0) 9.0 (5.0, 14.6) 28.9 (21.9, 36.6) 0.80
 Female 189 6.0 (5.0) 6.0 (5.0) 7.9 (4.5, 12.8) 26.5 (20.3, 33.4) 0.84
Birth order of index child,  
 2nd birth 269 6.0 (5.0) 7.0 (5.0) 7.8 (4.9, 11.7) 28.3 (23.0, 34.0) 0.82
 3rd birth 76 8.0 (6.5) 8.0 (3.75) 10.5 (4.7, 19.7) 25.0 (15.8, 36.3) 0.84
Age at introduction of cereals, monthsd  
 < 4 96 4.0 (5.2) 5.0 (4.9) 10.4 (5.1, 18.3) 32.3 (23.1, 42.6) 0.78
 ≥4 236 7.0 (5.0) 8.0 (3.0) 7.2 (4.3, 11.3) 26.3 (20.8, 32.4) 0.82
Age at introduction of another kind of milk, monthse  
 < 4 132 2.5 (2.9) 3.0 (4.0) 3.8 (1.2, 8.6) 37.1 (28.9, 46.0) 0.69
 ≥4 191 8.0 (3.0) 8.0 (3.0) 10.5 (6.5, 15.7) 20.9 (15.4, 27.4) 0.67
  1. Comparison of recalled and recorded breastfeeding data.
  2. Abbreviations: IQR, interquartile range; ICC=Intraclass correlation coefficient; BMI, body mass index; SGA, small for gestational age.
  3. a Number with missing data body mass index: n=1.
  4. b n.c. =not calculated.
  5. c SGA defined as birth weight <10 percentile for gestational age, gender and parity [20].
  6. d Numbers with missing data on age at introduction of cereals: n=13.
  7. e Numbers with missing data on age at introduction of another kind of milk: n=22.