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Table 3 Characteristics of respondents not followed-up and followed-up in COTASS-2, using data from COTASS-1

From: The Colombo Twin and Singleton Follow-up Study: a population based twin study of psychiatric disorders and metabolic syndrome in Sri Lanka

 

Lost to follow up (COTASS 1 only, N = 2059)

Followed-up (COTASS1 + 2, N = 3876)a

Lost to follow-up VS followed upb

% /mean (n)

% /mean (n)

p-value

Χ2 / t-test

Twin or singleton

  

<0.001

 Twin

52.4 (1078)

73.5 (2849)

 

 Singleton

47.6 (981)

26.5 (1027)

 

Gender

  

<0.001

 Male

52.5 (1082)

42.1 (1633)

 

 Female

47.5 (977)

57.9 (2243)

 

Mean age (years)

38.0 (2055)

36.7 (3876)

<0.001

Age (years)

  

<0.001

 16–24

25.1 (515)

23.7 (918)

 

 25–34

24.0 (494)

26.4 (1024)

 

 35–44

18.4 (379)

20.6 (798)

 

 45–54

15.0 (308)

16.2 (627)

 

 55–64

10.0 (205)

9.0 (349)

 

 65–74

5.3 (109)

3.5 (136)

 

 75 or over

2.2 (45)

0.6 (24)

 

Marital status

  

0.114

 Married

58.0 (1194)

61.4 (2378)

 

 Widowed

5.1 (105)

4.8 (185)

 

 Divorced/Separated

1.6 (32)

1.4 (53)

 

 Never married

35.3 (727)

32.4 (1255)

 

Ethnicity

  

0.001

 Sinhala

90.4 (1862)

93.4 (3619)

 

 Tamil

3.1 (63)

2.6 (102)

 

 Muslim

6.1 (126)

3.7 (145)

 

 Other

0.4 (8)

0.3 (10)

 

Urbanicity

  

<0.001

 Semi-urban

56.8 (1170)

62.9 (2436)

 

 Urban

43.2 (889)

37.1 (1438)

 

Employment

  

0.118

 Not in employment

39.4 (809)

41.8 (1617)

 

 Student

8.2 (169)

8.0 (308)

 

 Part-time employment

13.0 (267)

14.2 (549)

 

 Full-time employment

39.3 (806)

36.1 (1396)

 

Social class

  

0.079

 Rich

30.5 (252)

25.9 (385)

 

 Middle class

33.3 (276)

34.9 (518)

 

 Poor

36.2 (299)

39.2 (583)

 

Financial strain

  

0.177

 Living comfortably

8.9 (183)

7.9 (304)

 

 Doing alright

64.1 (1316)

64.7 (2504)

 

 Just about getting by

13.0 (267)

14.6 (563)

 

 Difficult to make ends meet

8.9 (182)

8.7 (336)

 

 Very difficult to make ends meet

5.2 (106)

4.2 (162)

 

Hungry due to lack of money

  

0.653

 No

96.3 (1978)

96.0 (3716)

 

 Yes

3.7 (77)

4.0 (155)

 

Self-rated health

  

0.032

 Good, very good or excellent

57.5 (1179)

54.6 (2109)

 

 Fair or poor

42.5 (870)

45.4 (1756)

 

Depressive episode (lifetime)c

  

0.750

 No

94.6 (1945)

94.4 (3653)

 

 Yes

5.4 (110)

5.6 (215)

 
  1. aFollowed-up respondents represent the cohort with data at both COTASS 1 and 2; COTASS 2 respondents which were excluded from COTASS 1 could not be included in these analyses (n = 93)
  2. bAnalyses account for clustering by twins
  3. cEstimated using the Composite International Diagnostic Interview