TABLE 3

Lung function variables stratified by body mass index (BMI) category in participants with and without central obesity

VariableParticipants 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 % predicted99 (90–109)102 (93–112)103 (93–113)105 (96–115)99 (89–109)100 (90–110)98 (88–109)88 (80–100)
FVC % predicted100 (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 % predicted98 (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-score0.00 (−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.