Table 1

Baseline characteristics according to spirometric Global Initiative for Chronic Obstructive Lung Disease (GOLD) grades* and ABCD groups† among participants with chronic obstructive pulmonary disease (COPD) in the HUNT2 Lung Study

ParticipantsEver smokersEducation ≥10 yearsInactiveCardiovascular diseaseBody mass index (kg/m2)Age (years)
n (%)‡n (%)§n (%)§n (%)§n (%)§Mean (SD)Mean (SD)
Women
GOLD grades (n=584)
GOLD 1173 (29.6)95 (58.6)51 (32.1)19 (12.9)21 (12.1)26.7 (4.7)62.4 (15.9)
GOLD 2338 (57.9)240 (75.0)98 (32.1)43 (16.8)46 (13.6)27.1 (5.6)61.7 (12.0)
GOLD 364 (11.0)49 (83.1)12 (23.5)6 (17.6)10 (15.6)24.3 (4.4)63.7 (10.2)
GOLD 49 (1.5)6 (85.7)3 (37.5)3 (42.9)1 (11.1)23.5 (2.7)59.6 (8.9)
ABCD groups (n=468)
 Group A278 (59.4)179 (69.4)90 (35.3)24 (10.8)31 (11.2)26.3 (5.0)61.9 (13.9)
 Group B100 (21.4)75 (77.3)25 (26.3)19 (24.4)13 (13.0)29.1 (6.1)62.3 (12.2)
 Group C42 (9.0)26 (63.4)10 (28.6)1 (3.7)8 (19.0)24.3 (3.7)63.4 (11.3)
 Group D48 (10.3)33 (78.6)11 (28.2)6 (20.0)7 (14.6)27.0 (5.0)64.6 (9.7)
Men
GOLD grades (n=956)
 GOLD 1251 (26.3)197 (83.1)117 (50.0)17 (7.8)44 (17.5)26.6 (3.6)61.6 (13.6)
 GOLD 2545 (57.0)471 (89.0)216 (44.3)56 (12.4)136 (25.0)26.5 (3.8)64.5 (12.5)
 GOLD 3140 (14.6)124 (94.7)36 (28.8)17 (15.6)27 (19.3)25.1 (3.8)69.6 (9.5)
 GOLD 420 (2.1)20 (100.0)4 (23.5)4 (26.7)4 (20.0)23.9 (2.8)67.7 (7.9)
ABCD groups (n=736)
 Group A453 (61.6)371 (85.5)207 (49.5)29 (7.5)80 (17.7)26.2 (3.5)62.8 (12.9)
 Group B116 (15.8)109 (95.6)41 (40.2)17 (18.3)41 (35.3)28.0 (4.4)66.2 (11.7)
 Group C100 (13.6)81 (86.2)38 (40.4)12 (15.2)16 (16.0)25.2 (3.3)67.5 (11.0)
 Group D67 (9.1)61 (93.8)18 (32.7)13 (24.5)15 (22.4)25.3 (4.2)69.3 (9.5)
  • *COPD defined as forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC) <0.70 and graded as follows; GOLD 1=per cent predicted FEV1 (ppFEV1) ≥80; GOLD 2=50≤ ppFEV1 <80; GOLD 3=30≤ ppFEV1 <50; GOLD 4=ppFEV1 <30.

  • †ABCD groups defined as follows; A=dyspnoea ≤grade 1, GOLD 1 or 2, and ≤1 exacerbation last 12 months; B=dyspnoea ≥grade 2, GOLD 1 or 2, and ≤1 exacerbation last 12 months; C=dyspnoea ≤grade 1, and GOLD 3 or 4 or ≥2 exacerbations last 12 months; D=dyspnoea ≥grade 2, and GOLD 3 or 4 or ≥2 exacerbations last 12 months.

  • ‡% of total.

  • §% within spirometric GOLD grade or ABCD group, missing excluded.