Table 2

Distribution of lung function markers in Australian children and parents

Lung function measure	All				Males				Females
Lung function measure	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.