Table 3 The relation between the duration of breastfeeding and the risks of current asthma, persistent wheezing, cough, and phlegm at the end of the follow-up period (N = 1933).

0–3 months

1.44

0.78, 2.66

1.64

0.77, 3.52

1.72

0.94, 3.15

2.38

1.20, 4.70

4–6 months

1.00 (reference)

1.38

0.64, 2.97

1.35

0.73, 2.50

1.90

0.95, 3.79

7–9 months

1.16

0.65, 2.08

1.00 (reference)

1.00 (reference)

1.00 (reference)

9–12 months

1.72

0.97, 2.08

1.15

0.53, 2.50

1.21

0.65, 2.25

1.87

0.95, 3.71

> 12 months

1.60

0.83, 2.08

2.26

1.07, 4.79

1.63

0.84, 3.16

2.88

1.42, 5.84

Change in breastfeeding

From optimal to shorter per month ^†

1.10

0.92, 1.32

1.12

0.99, 1.19

1.08

0.98, 1.19

1.11

1.00, 1.24

From optimal to longer per month ^‡

1.03

1.00, 1.05

1.05

1.03, 1.08

1.04

1.02, 1.06

1.04

1.01, 1.06