Table 4 Adjusted risk ratios of adverse health outcomes in the first grade in primary school for children with different durations (months) of any breastfeeding within their first 24 months

Overweight or obesity

1.00

0.96 (0.79, 1.18)

1.00

1.02 (0.88, 1.18)

1.00

1.04 (0.92, 1.16)

1.00

0.89 (0.78, 1.02)

1.00

0.82 (0.63, 1.07)

1.00

0.66 (0.37, 1.18)

Obesity

1.37 (0.88, 2.13)

1.10 (0.83, 1.46)

1.06 (0.85, 1.32)

0.91 (0.70, 1.18)

0.93 (0.57, 1.52)

0.90 (0.34, 2.33)

Central obesity defined by the 90th waist circumference percentile

1.43 (0.93, 2.19)

1.11 (0.88, 1.41)

1.03 (0.86, 1.24)

0.83 (0.63, 1.10)

0.98 (0.73, 1.31)

1.22 (0.73, 2.06)

Central obesity defined by WHTR ≥ 0.5

1.51 (0.92, 2.48)

1.19 (0.90, 1.58)

0.96 (0.77, 1.19)

0.76 (0.55, 1.06)

0.67 (0.43, 1.06)

0.73 (0.30, 1.76)

Elevated systolic blood pressure or stage 1 & 2 hypertension

0.98 (0.81, 1.19)

1.10 (0.96, 1.27)

0.99 (0.89, 1.10)

0.84 (0.74, 0.96)*

0.90 (0.71, 1.14)

0.85 (0.53, 1.36)

Stage 1 & 2 hypertension - systolic blood pressure

1.01 (0.78, 1.30)

1.13 (0.94, 1.36)

0.96 (0.84, 1.11)

0.83 (0.70, 0.98)*

0.91 (0.67, 1.24)

0.93 (0.52, 1.66)

Elevated diastolic blood pressure or stage 1 & 2 hypertension

1.01 (0.83, 1.22)

1.05 (0.92, 1.21)

1.04 (0.93, 1.16)

0.88 (0.78, 1.00)

0.82 (0.64, 1.05)

0.81 (0.50, 1.31)

Stage 1 & 2 hypertension - diastolic blood pressure

1.06 (0.78, 1.44)

1.13 (0.91, 1.41)

1.10 (0.92, 1.31)

0.96 (0.78, 1.17)

0.98 (0.68, 1.42)

0.81 (0.37, 1.75)