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Table 2 Comparison of baseline characteristics between completers (who participated in both surveys) vs. drop-outs (who participated only in the baseline survey)

From: Cohort profile: the Saskatchewan Rural Health Study—adult component

  Completers (n = 4741) Drop-outs (n = 3520) p value
Quadranta 0.23
 Southwest 854 (18.0) 684 (19.5)  
 Southeast 1016 (21.4) 776 (22.1)  
 Northeast 1391 (29.3) 1009 (28.7)  
 Northwest 1480 (31.2) 1047 (29.8)  
Rural municipalitya, n (%) 0.0001
 Town 2050 (43.2) 1735 (49.4)  
 RM 2691 (56.8) 1781 (50.7)  
Location of homea, n (%) 0.0001
 Farm 2127 (45.1) 1318 (37.8)  
 Non-farm 2593 (54.9) 2170 (62.2)  
Sex, n (%) 0.21
 Male 2305 (48.6) 1759 (50.0)  
 Female 2436 (51.4) 1758 (50.0)  
Age, n (%) 0.0001
 18–45 893 (18.8) 1051 (29.9)  
 46–55 1261 (26.6) 787 (22.4)  
 56–65 1273 (26.9) 675 (19.2)  
 > 65 1314 (27.7) 1004 (28.6)  
 Mean ± S.E. 57.0 ± 0.2 55.4 ± 0.5 0.002
Socio-economic status
 Income, n (%) 0.0001
  Money left at end of montha
   Some money 2653 (61.7) 1774 (56.4)  
   Just enough money 900 (20.9) 695 (22.1)  
   Not enough money 749 (17.4) 679 (21.6)  
  Lowest income 134 (3.3) 190 (6.5) 0.0001
  Lowest middle income 624 (15.4) 592 (20.3)  
  Upper middle income 1437 (35.3) 868 (29.8)  
  Highest income 1871 (46.0) 1261 (43.3)  
 Educationa, n (%) 0.0001
  ≤ grade 12 2716 (57.9) 2225 (64.2)  
  > grade 12 1979 (42.2) 1239 (35.8)  
Respiratory health outcomes, n (%)
 Cougha 677 (14.4) 558 (16.1) 0.04
 Wheeze 1886 (39.8) 1471 (41.8) 0.07
 Asthma 386 (8.1) 329 (9.4) 0.05
 Chronic bronchitisa 281 (6.0) 202 (5.9) 0.82
 COPDa 91 (1.9) 99 (2.9) 0.006
Lung function (mean ± S.E.)
 Male N = 577 N = 185  
  FVC 4.73 ± 0.04 4.67 ± 0.07 0.44
  FEV1 3.59 ± 0.03 3.53 ± 0.06 0.42
  FEV1/FVC*100 75.81 ± 0.31 75.36 ± 0.6 0.49
  FEF25–75 3.13 ± 0.05 3.07 ± 0.09 0.53
 Female N = 644 N = 203  
  FVC 3.40 ± 0.03 3.43 ± 0.05 0.55
  FEV1 2.66 ± 0.02 2.67 ± 0.04 0.75
  FEV1/FVC*100 78.02 ± 0.2 77.6 ± 0.5 0.44
  FEF25–75 2.52 ± 0.04 2.52 ± 0.07 0.99
  1. p values are reported from Chi square test (categorical variable) and t-test (continuous variable)
  2. aTotal are not adding up to n because there are some missing values