Prevalence of lung function deficit at age 5 and 8 years
| Age 5 years | Age 8 years | |
| Indicator# | n/total (%) | n/total (%) |
| FEV0.5 (<LLN) | 47/777 (6.0%) | 44/581 (7.6%) |
| FEV1 (<LLN) | 53/792 (6.7%) | 46/676 (6.8%) |
| FVC (<LLN) | 57/792 (7.2%) | 51/676 (7.5%) |
| FEV0.5/FVC (<LLN) | 47/776 (6.1%) | 35/581 (6.0%) |
| FEV1/FVC (<LLN) | 49/791 (6.2%) | 30/675 (4.4%) |
n: cases with the indicator; LLN: lower limit of normal or below the 5th percentile of predicted; FEV: forced expiratory volume in either 0.5 (FEV0.5) or 1 s (FEV1); FVC: forced vital capacity. #: see table S1 for exact definitions.