TABLE 3.
Lung function variables stratified by body mass index (BMI) category in participants with and without central obesity
| Variable | Participants without central obesity # (n=13 412) | Participants with central obesity# (n=9327) | ||||||
| Underweight¶ (n=541) | Normal weight+ (n=7515) | Overweight§ (n=4924) | Mild obesityf (n=177) | Normal weight+ (n=914) | Overweight§ (n=4654) | Mild obesityf (n=3277) | Morbid obesity ## (n=128) | |
| FEV1 % predicted | 99 (90–109) | 102 (93–112) | 103 (93–113) | 105 (96–115) | 99 (89–109) | 100 (90–110) | 98 (88–109) | 88 (80–100) |
| FVC % predicted | 100 (91–111) | 102 (94–113) | 102 (92–112) | 103 (94–113) | 98 (89–109) | 98 (89–109) | 95 (86–106) | 85 (78–96) |
| FEV1/FVC % predicted | 98 (92–103) | 100 (94–105) | 101 (96–106) | 104 (100–108) | 100 (94–105) | 102 (96–106) | 103 (98–108) | 104 (98–108) |
| FEV1 z-score | −0.06 (−0.73 to 0.60) | 0.12 (−0.51 to 0.82) | 0.19 (−0.47 to 0.92) | 0.38 (−0.26 to 1.10) | −0.06 (−0.73 to 0.59) | 0.00 (−0.69 to 0.67) | −0.12 (−0.84 to 0.60) | −0.82 (−1.37 to −0.01) |
| FVC z-score | 0.00 (−0.61 to 0.74) | 0.15 (−0.44 to 0.85) | 0.13 (−0.51 to 0.83) | 0.17 (−0.47 to 0.92) | −1.10 (−0.72 to 0.61) | −0.12 (−0.74 to 0.57) | −0.31 (−0.97 to 0.39) | −1.05 (−1.58 to −0.22) |
| FEV1/FVC z-score | −0.27 (−1.00 to 0.30) | −0.08 (−0.69 to 0.47) | 0.12 (−0.53 to 0.68) | 0.39 (−0.08 to 0.90) | −0.07 (−0.74 to 0.48) | 0.13 (−0.48 to 0.69) | 0.30 (−0.31 to 0.86) | 0.44 (−0.28 to 0.90) |
Data are presented as median (IQR). The combination of underweight and central obesity is not presented since only two subjects were in this category. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; IQR: interquartile range. #: waist circumference (WC) ≥88 cm for women and ≥102 cm for men; ¶: BMI <20 kg·m−2; +: BMI 20–24 kg·m−2; §: BMI 25–29 kg·m−2; f: BMI 30–39 kg·m−2; ##: BMI ≥40 kg·m−2.