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Table 3 Demographic characteristics of respondents and non-respondents of non-western origin at the three waves of the longitudinal study*

From: Selective attrition and bias in a longitudinal health survey among survivors of a disaster

 

Respondents at wave 1 only

(N = 118)

Respondents at waves 1 & 2

(N = 75)

Respondents at waves 1 & 3

(N = 73)

Respondents at waves 1, 2, 3

(N = 86)

p value

 

% (95% CI)

% (95% CI)

% (95% CI)

% (95% CI)

 

Male

53.4 (44.3–62.4)

48.0 (36.5–59.3)

45.2 (33.6–56.6)

45.4 (34.7–55.9)

0.6

Age

     

   18 – 24

20.5 (13.1–27.8)

12.2 (4.7–19.6)

17.8 (8.9–26.6)

8.1 (2.2–13.9)

0.03

   25 – 44

55.6 (46.5–64.6)

43.2 (31.8–54.4)

57.5 (46.0–68.8)

60.5 (50.0–70.8)

 

   45 – 64

22.2 (14.6–29.7)

40.5 (29.2–51.6)

21.9 (12.3–31.4)

31.4 (21.4–41.2)

 

   65+

1.7 (0.0–4.0)

4.1 (0.0–8.6)

2.7 (0.0–6.4)

0.0

 

Age, Mean

35.9 (33.5–38.4)

41.1 (37.9–44.2)

36.4 (33.4–39.4)

38.5 (36.1–40.8)

0.04

Education

     

   Primary school

39.8 (30.9–48.6)

52.1 (40.6–63.4)

43.1 (31.6–54.5)

38.3 (27.9–48.6)

0.8

   Junior high

23.9 (16.1–31.6)

21.1 (11.7–30.3)

23.5 (13.6–33.2)

22.2 (13.3–31.0)

 

   Senior high/professional

29.2 (20.9–37.4)

22.5 (12.9–32.0)

23.6 (13.7–33.3)

29.6 (19.8–39.3)

 

   High professional/university

7.1 (2.4–11.7)

4.2 (0.0–8.7)

9.7 (2.8–16.5)

9.9 (3.5–16.2)

 

Paid job

41.4 (32.4–50.3)

40.6 (29.3–51.7)

46.0 (34.4–57.4)

39.2 (28.7–49.5)

0.9

Single

23.3 (15.6–30.9)

15.3 (7.0–23.5)

17.1 (8.3–25.7)

12.9 (5.7–20.0)

0.3

  1. * Groups of respondents are exclusive; Anova was used for continuous variables and X2-tests for categorical variables