Lung function measure | All | Males | Females | |||||||||
n | Mean | SD | 95% CI | n | Mean | SD | 95% CI | n | Mean | SD | 95% CI | |
Children | ||||||||||||
Raw | ||||||||||||
FEV1 (L) | 1759 | 2.47 | 0.43 | 2.45 to 2.50 | 902 | 2.47 | 0.44 | 2.43 to 2.50 | 857 | 2.48 | 0.41 | 2.45 to 2.51 |
FVC (L) | 1759 | 2.99 | 0.53 | 2.96 to 3.02 | 902 | 3.04 | 0.55 | 3.00 to 3.09 | 857 | 2.93 | 0.49 | 2.89 to 2.97 |
FEV1/FVC ratio | 1759 | 83.1 | 7.29 | 82.7 to 83.5 | 902 | 81.40 | 7.00 | 80.9 to 81.9 | 857 | 85.01 | 7.13 | 84.4 to 85.6 |
MEF (FEF25%–75%) (L/s) | 1759 | 2.6 | 0.73 | 2.56 to 2.64 | 902 | 2.47 | 0.69 | 2.42 to 2.52 | 857 | 2.74 | 0.75 | 2.68 to 2.80 |
z-Scores | ||||||||||||
FEV1 | 1754 | 0.33 | 1.07 | 0.27 to 0.39 | 900 | 0.26 | 1.07 | 0.17 to 0.35 | 854 | 0.41 | 1.06 | 0.32 to 0.49 |
FVC | 1754 | 0.83 | 1.14 | 0.76 to 0.90 | 900 | 0.8 | 1.14 | 0.71 to 0.90 | 854 | 0.85 | 1.14 | 0.76 to 0.95 |
FEV1/FVC ratio | 1754 | −0.72 | 1.16 | −0.79 to −0.66 | 900 | −0.78 | 1.14 | −0.87 to −0.69 | 854 | −0.67 | 1.18 | −0.76 to −0.57 |
MEF (FEF25%–75%) | 1754 | −0.48 | 1.09 | −0.54 to −0.42 | 900 | −0.54 | 1.08 | −0.62 to −0.45 | 854 | −0.42 | 1.11 | −0.51 to −0.33 |
Parents | ||||||||||||
Raw | ||||||||||||
FEV1 (L) | 1774 | 3.03 | 0.59 | 2.99 to 3.06 | 221 | 3.85 | 0.62 | 3.76 to 3.94 | 1553 | 2.91 | 0.49 | 2.88 to 2.94 |
FVC (L) | 1774 | 3.95 | 0.77 | 3.90 to 3.99 | 221 | 5.08 | 0.81 | 4.95 to 5.20 | 1553 | 3.79 | 0.62 | 3.75 to 3.83 |
FEV1/FVC ratio | 1774 | 77.0 | 7.04 | 76.6 to 77.4 | 221 | 76.1 | 6.75 | 75.1 to 77.0 | 1553 | 77.1 | 7.07 | 76.7 to 77.6 |
MEF (FEF25%–75%) (L/s) | 1774 | 2.72 | 0.93 | 2.67 to 2.78 | 221 | 3.34 | 1.06 | 3.17 to 3.50 | 1553 | 2.64 | 0.88 | 2.58 to 2.70 |
z-Scores | ||||||||||||
FEV1 | 1760 | 0.28 | 1.10 | 0.22 to 0.35 | 221 | 0.15 | 0.93 | 0.03 to 0.28 | 1539 | 0.3 | 1.12 | 0.23 to 0.37 |
FVC | 1760 | 0.85 | 1.15 | 0.79 to 0.92 | 221 | 0.65 | 0.97 | 0.51 to 0.78 | 1539 | 0.88 | 1.17 | 0.81 to 0.95 |
FEV1/FVC ratio | 1760 | −0.85 | 1.07 | −0.92 to −0.79 | 221 | −0.74 | 1.04 | −0.89 to −0.60 | 1539 | −0.87 | 1.07 | −0.94 to −0.80 |
MEF (FEF25%–75%) | 1760 | −0.45 | 1.10 | −0.52 to −0.39 | 221 | −0.31 | 0.98 | −0.46 to −0.17 | 1539 | −0.47 | 1.11 | −0.55 to −0.40 |
Sample weights applied to data.
n, number of participants in cohort with this measure (denominator).
FEF, forced expiratory flow; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; MEF, mid expiratory flow.