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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.