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Table 1 Study population by age, sex and area.

From: West Sweden Asthma Study: Prevalence trends over the last 18 years argues no recent increase in asthma

   Age (years) Sex   Area   
Study population   16-25 26-35 36-45 46-55 56-65 66-76 Men Women p-value West Gothia Gothenburg p-value Total
Initial study sample N              30000
Not possible to trace N (%) 157 (2.3) 165 (2.8) 80 (1.4) 49 (1.0) 26 (0.5) 12 (0.4) 311 (2.0) 178 (1.2) < 0.001 175 (1.2) 314 (2.1) < 0.001 489 (1.6)
Deceased N (%) 1 (0.02) 1 (0.02) 1 (0.02) 3 (0.06) 2 (0.04) 9 (0.3) 11 (0.07) 6 (0.04) 0.225 9 (0.1) 8 (0.1) < 0.001 17 (0.06)
Moved N (%) 40 (0.7) 24 (0.4) 12 (0.2) 3 (0.06) 2 (0.04) 6 (0.2) 41 (0.3) 46 (0.3) 0.594 30 (0.2) 57 (0.4) 0.005 87 (0.3)
Not able due to disease or disability N (%) 11 (0.2) 11 (0.2) 14 (0.2) 18 (0.4) 33 (0.7) 34 (1.2) 66 (0.4) 55 (0.4) 0.318 64 (0.4) 57 (0.4) 0.525 121 (0.4)
Other causes N (%) 11 (0.2) 14 (0.2) 9 (0.2) 13 (0.3) 9 (0.2) 12 (0.4) 37 (0.3) 31 (0.2) 0.544 32 (0.2) 36 (0.2) 0.716 68 (0.2)
Real study sample N 5242 5653 5593 4947 4941 2842 14534 14684   14691 14527   29218
Did not want to participate or returned a blank questionnaire N (%) 61 (1) 50 (1) 56 (1) 62 (1) 88 (2) 82 (3) 186 (1) 213 (2) 0.226 222 (2) 177 (1) 0.034 399 (1)
Non-responders N (%) 2577 (49) 2484 (44) 2247 (40) 1660 (34) 1194 (24) 570 (20) 6158 (42) 4574 (31) < 0.001 5039 (34) 5693 (39) < 0.001 10732 (37)
Responders N (%) 2604 (51) 3119 (55) 3290 (59) 3225 (65) 3659 (74) 2190 (77) 8190 (56) 9897 (67) < 0.001 9430 (64) 8657 (60) < 0.001 18087 (62)
  1. Difference (p-value) by sex and area.