| 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 | Â | Â | <0.001 |
 Twin | 52.4 (1078) | 73.5 (2849) |  |
 Singleton | 47.6 (981) | 26.5 (1027) |  |
Gender | Â | Â | <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) | Â | Â | <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 | Â | Â | 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 | Â | Â | 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 | Â | Â | <0.001 |
 Semi-urban | 56.8 (1170) | 62.9 (2436) |  |
 Urban | 43.2 (889) | 37.1 (1438) |  |
Employment | Â | Â | 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 | Â | Â | 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 | Â | Â | 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 | Â | Â | 0.653 |
 No | 96.3 (1978) | 96.0 (3716) |  |
 Yes | 3.7 (77) | 4.0 (155) |  |
Self-rated health | Â | Â | 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 | Â | Â | 0.750 |
 No | 94.6 (1945) | 94.4 (3653) |  |
 Yes | 5.4 (110) | 5.6 (215) |  |