Effect of the X-promoter polymorphism on mean lung function values in either homozygous or heterozygous adults
| Haplotype groups | FEV1 % | FVC % |
| A/A | ||
| YA/YA | 61.5±2.8# | 81.9±2.5¶ |
| YA/XA | 66.2±2.7# | 83.3±2.5¶ |
| XA/XA | 75.1±8.6# | 91.5±6.2¶ |
| A/O | ||
| YA/O | 61.2±2.8+ | 81.6±2.5+ |
| XA/O | 60.1±3.6+ | 83.0±3.4+ |
Data are presented as mean±sem. FEV1: forced expiratory volume in one second; FVC: forced vital capacity. #: p=0.1; ¶: p=0.3; +: p=0.8