TABLE 3

Median, 5th and 95th percentile and percent below LLN for z-FEV₁, z-FVC and z-FEV₁/FVC stratified by age and sex in the Norwegian reference sample

Sex	Index	Adolescents aged <20 years					Adults aged >20 years
		Subjects n	50%	5%	95%	%<LLN^#	Subjects n	50%	5%	95%	%<LLN^#
Male	FEV₁	4559	0	−1.61	1.74	4.58	1035	0.06	−1.35	1.64	2.41
	FVC		−0.1	−1.69	1.76	5.52		0.11	−1.3	1.54	1.83
	FEV₁/FVC		0.06	−1.68	1.36	5.31		−0.02	−1.49	1.22	3.29
Female	FEV₁	4166	−0.04	1.78	1.57	6.12	1403	0.15	−1.4	1.79	3.14
	FVC		0.03	−1.60	1.61	4.60		0.25	−1.18	1.76	1.71
	FEV₁/FVC		−0.11	−1.72	0.98	5.83		−0.17	−1.51	0.98	3.71

FEV₁: forced expiratory volume in 1 s; FVC: forced vital capacity; LLN: lower limit of normal. ^#: according to GLI-2012.