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Table 3 Breastfeeding duration by categories and distribution of recall error (n=374)

From: Maternal recall of breastfeeding duration twenty years after delivery

  Recalled breastfeeding duration, months Distribution of recall error, n (%)
Recorded breastfeeding duration, months Never >0 - 3 4 - 6 7 - 9 10 -12 ≥13 Total ƙa Underreport Exact recall Overreport
Never 0 0 0 0 0 0 0     
>0 - 3 8 63 22 6 0 0 99 0.70 8 (8.1) 63 (63.6) 28 (28.2)
4 - 6 0 3 49 24 4 1 81 0.47 3 (3.7) 49 (60.5) 29 (38.8)
7 - 9 0 0 13 72 20 3 108 0.50 13 (12.0) 72 (66.7) 23 (21.3)
10 -12 0 0 1 12 37 7 57 0.53 13 (22.8) 37 (64.9) 7 (12.3)
≥13 0 0 0 1 4 24 29 0.72 5 (17.2) 24 (82.6) 0 (0)
Total 8 66 85 115 65 35 374 0.85 42 (11.2) 245 (65.5) 87 (23.2)
  1. a Kappa statistics were calculated for each of the categories in relation to all of the other categories in 2×2 tables, as well as overall weighted ƙ for the ordinal multi categories of breastfeeding duration. All p-values <0.001.