Table 2

 Lung function estimates for BX (Polgar reference)

StrategyIntercept at age 10(95% CI)Slope (95% CI)
FEF25–75, forced expiratory flow 25–75%; FEV1, forced expiratory volume in 1 second, FVC, forced vital capacity.
FVC (% predicted)Best annual79% (74 to 83)−0.7% (−1.7 to +0.3)
All data74% (70 to 78)−0.0% (−1.0 to +1.0)
FEV1 (% predicted)Best annual68% (63 to 72)−1.9% (−2.9 to −0.9)
All data63% (58 to 68)−0.9% (−1.6 to −0.1)
FEF25–75 (% predicted)Best annual61% (53 to 68)−2.6% (−3.9 to −1.4)
All data52% (45 to 59)−1.1% (−2.1 to 0.0)
FEV1/FVC ratioBest annual79% (76 to 82)−1.1% (−1.5 to −0.7)
All data76% (74 to 79)−0.9% (−1.4 to −0.3)