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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