Skip to main content

Table 1 Basic characteristics of the study sample examined during 2009–2012

From: Decreased COPD prevalence in Sweden after decades of decrease in smoking

Characteristic   Sex Area All P-value for difference by
Women Men South-western Sweden Northern Sweden
n = 968 n = 871 n = 1148 n = 691 n = 1839 Sex Area
Age Mean (SD) 50.3 (14.9) 52.1 (14.8) 50.6 (15.1) 52.0 (14.3) 51.1 (14.8) 0.010 0.058
BMI Mean (SD) 26.3 (4.8) 26.9 (3.7) 26.2 (4.2) 27.2 (4.5) 26.6 (4.4) 0.003  < 0.001
Never-smoker n (%) 491 (50.7%) 475 (54.6%) 610 (53.1%) 356 (51.6%) 966 (52.6%)   
Ex-smoker n (%) 324 (33.5%) 313 (36.0%) 407 (35.5%) 230 (33.3%) 637 (34.7%)   
Current smoker n (%) 153 (15.8%) 82 (9.4%) 131 (11.4%) 104 (15.1%) 235 (12.8%)  < 0.001 0.072
Never-smoker n (%) 491 (51.3%) 475 (54.8%) 610 (53.5%) 356 (52.0%) 966 (53.0%)   
 ≤ 10 packyears n (%) 244 (25.5%) 189 (21.8%) 266 (23.3%) 167 (24.4%) 433 (23.7%)   
11–20 packyears n (%) 126 (13.2%) 61 (7.0%) 114 (10.0%) 73 (10.7%) 187 (10.3%)   
21–30 packyears n (%) 64 (6.7%) 61 (7.0%) 71 (6.2%) 54 (7.9%) 125 (6.9%)   
 > 30 packyears n (%) 33 (3.4%) 80 (9.2%) 79 (6.9%) 34 (5.0%) 113 (6.2%)  < 0.001 0.292
Exp to GDF at work n (%) 142 (14.8%) 353 (41.1%) 282 (24.7%) 213 (31.6%) 495 (27.3%)  < 0.001 0.002
University education n (%) 447 (46.7%) 303 (35.5%) 533 (46.6%) 217 (32.6%) 750 (41.4%)  < 0.001  < 0.001
  1. BMI Body Mass Index. One subject from the OLIN sample lack information on smoking habits. Information on number of packyears is lacking for 6 ever-smokers from OLIN and 8 ever-smokers from WSAS. Information on Exp to GDF at work is lacking for 16 subjects from OLIN and 8 subjects from WSAS. Information on Educational level is lacking for 25 subjects from OLIN and 3 subjects from WSAS. P-values from pearson's chi-square or student's T-test, as appropriate
  2. Bold font indicates P < 0.05
\