. 2021 Jun 18;37:100974. doi: 10.1016/j.eclinm.2021.100974

Table 1.

Baseline characteristics according to lung function in 108 246 individuals in the general population.

	Below normal lung function (n = 12 364)	Normal lung function (n = 91 938)	Supernormal lung function (n = 3944)
Age – years	61·0 (51·8–69·3)^*	57·9 (47·9–67·2)	53·4 (44·3–65·6)^*^,^†
Male sex – no. (%)	5738 (46)^*	41 504 (45)	1429 (36)^*^,^†
Weight – kg	77·7 (66·7–90·0)^*	75·5 (65·7–86·1)	73·5 (64·7–83·7)^*^,^†
Height – cm	171 (165–178)	171 (165–178)	172 (165–179)^*^,^†
BMI – kg/m²	26·3 (23·4–29·7)^*	25·5 (23·2–28·3)	24·9 (22·8–27·2)^*^,^†
Lung function
FEV₁ – L	2·02 (1·58–2·47)^*	3·00 (2·49–3·60)	3·90 (3·39–4·69)^*^,^†
FEV₁% predicted –%	69 (60–75)^*	98 (90–106)	126 (122–132)^*^,^†
FVC – L	2·94 (2·39–3·57)^*	3·87 (3·24–4·64)	4·80 (4·19–5·81)^*^,^†
FVC% predicted –%	78 (70–85)^*	101 (92–109)	125 (119–132)^*^,^†
FEV₁/FVC	0·69 (0·61–0·76)^*	0·78 (0·74–0·82)	0·81 (0·78–0·84)^*^,^†
Smoking information
Never-smokers – no. (%)	2960 (24)^*	40 292 (44)	2026 (51)^*^,^†
Former smokers – no. (%)	5096 (41)	37 429 (41)	1575 (40)
Current smokers – no. (%)	4276 (35)^*	13 851 (15)	321 (8)^*^,^†
Unknown– no. (%)	32 (<1)^*	366 (<1)	22 (<1)^†
Tobacco consumption – pack-years^‡	30·0 (15·0–44·0)^*	14·8 (5·3–27·7)	7·5 (2·8–15·0)^*^,^†
Poor socioeconomic status – no. (%)	3634 (29)^*	15 161 (16)	524 (13)^*^,^†
Asthma – no. (%)	1935 (16)^*	4519 (5)	104 (3)^*^,^†
Treatment with airway medication – no. (%)	2359 (19)^*	4048 (4)	94 (2)^*^,^†

Data presented as median (25th and 75th percentiles), or number (percent). Numbers may not sum to 100 due to rounding. Based on the Copenhagen General Population Study. BMI=body mass index. FEV₁=forced expiratory volume in 1 sec. FVC=forced vital capacity.

^⁎

P < 0·05 for comparison with normal lung function using Wilcoxon's rank sum or Pearson's chi-squared test.

^†

P < 0·05 for comparison with below normal lung function using Wilcoxon's rank sum or Pearson's chi-squared test.

^‡

Includes only current and former smokers.