Table 3.
Characteristics of respondents not followed-up and followed-up in COTASS-2, using data from COTASS-1
| 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) |
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)
bAnalyses account for clustering by twins
cEstimated using the Composite International Diagnostic Interview