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Table 3 Associations of waist circumference (WC) and BMI measured at age 12 with FEV 1 , FVC and FEV 1 /FVC ratio separately for girls and boys

From: BMI, waist circumference at 8 and 12 years of age and FVC and FEV1 at 12 years of age; the PIAMA birth cohort study

  FEV1 FVC FEV1/FVC ratio
  Girls Boys Girls Boys Girls Boys
  % difference % difference % difference % difference % difference % difference
  (95% CI) (95% CI) (95% CI) (95% CI) (95% CI) (95% CI)
<10th percentile WC −4.3 (−7.2, −1.4) −2.9 (−5.9, 0.2) −5.6 (−8.3, −2.7) −5.6 (−8.3, −2.8) 1.1 (−0.4, 2.7) 2.3 (0.7, 4.0)
>90th percentile WC 1.7 (−1.2, 4.7) −1.1 (−4.2, 2.1) 4.1 (1.2, 7.2) 2.2 (−0.7, 5.2) −2.0 (−3.5, −0.5) −2.6 (−4.2, −1.1)
<10th percentile BMI −6.9 (−9.8, −4.0) −5.2 (−8.2, −2.2) −6.7 (−9.5, −3.8) −7.1 (−9.8, −4.4) −0.2 (−1.8, 1.4) 1.7 (0.0, 3.3)
>90th percentile BMI 2.7 (−0.3, 5.8) −1.3 (−4.4, 1.9) 5.1 (2.0, 8.3) 1.5 (−1.4, 4.5) −2.0 (−3.5, −0.5) −2.3 (−3.9, −0.7)
Adjusted for confounders*       
<10th percentile WC −3.4 (−6.2, −0.4) −3.0 (−6.1, 0.2) −4.7 (−7.5, −1.8) −5.6 (−8.3, −2.7) 1.2 (−0.4, 2.8) 2.2 (0.6, 3.9)
>90th percentile WC 1.0 (−2.0, 4.1) −1.3 (−4.5, 1.9) 3.6 (0.6, 6.8) 1.9 (−1.0, 5.0) −2.2 (−3.7, −0.7) −2.7 (−4.2, −1.1)
<10th percentile BMI −6.1 (−8.9, −3.1) −5.1 (−8.2, −2.0) −5.8 (−8.7, −2.9) −6.9 (−9.7, −4.1) −0.2 (−1.8, 1.4) 1.6 (−0.1, 3.3)
>90th percentile BMI 2.0 (−1.1, 5.2) −1.3 (−4.4, 2.0) 4.6 (1.5, 7.9) 1.5 (−1.4, 4.6) −2.2 (−3.8, −0.6) −2.3 (−3.8, −0.6)
  1. The results are a percent difference in the lung function testing variables of the children in the lowest and the highest 10% of sd-score of waist circumference and BMI, compared with children who have a waist circumference or BMI sd-score between the 10th and 90th percentile. All analyses were adjusted for the child’s height and age.
  2. *Adjusted for pubertal development and maternal education level.
  3. Bold represents a statistically significant association.