Table 3.
Comparative risk functions comparing non-response, demographic characteristics and self-completion by region with entire study population
| (a) Non-response | ||||||||||||
| Overall non-response | Non-response due to failure to trace families | Non-response of traced families | ||||||||||
| % | CRF | 95%CI | % | CRF | 95%CI | % | CRF | 95%CI | ||||
| North England | 35 | 0.9 | (0.7 to 1.2) | 22 | 2.0 | (1.5 to 2.8) | 15 | 0.6 | (0.4 to 0.9) | |||
| West Sweden | 62 | 2.8 | (2.2 to 3.5) | 16 | 1.4 | (1.0 to 1.9) | 52 | 3.4 | (2.6 to 4.3) | |||
| Northern Ireland | 49 | 1.6 | (1.3 to 2.1) | 5 | 0.3 | (0.2 to 0.6) | 41 | 2.2 | (1.7 to 2.8) | |||
| South East France | 45 | 1.4 | (1.0 to 1.9) | 19 | 1.7 | (1.1 to 2.5) | 21 | 0.8 | (0.5 to 1.3) | |||
| South West Ireland | 9 | 0.2 | (0.1 to 0.3) | 2 | 0.1 | (0.0 to 0.5) | 6 | 0.2 | (0.1 to 0.4) | |||
| East Denmark | 20 | 0.4 | (0.3 to 0.6) | 8 | 0.6 | (0.4 to 1.1) | 8 | 0.3 | (0.1 to 0.5) | |||
| Central Italy | 13 | 0.3 | (0.1 to 0.5) | 8 | 0.6 | (0.3 to 1.3) | 6 | 0.2 | (0.1 to 0.4) | |||
| South West France | 31 | 0.8 | (0.5 to 1.1) | 15 | 1.3 | (0.8 to 2.1) | 16 | 0.6 | (0.3 to 1.0) | |||
| North West Germany | ||||||||||||
| All centres | 37 | 1.0 | - | 12 | 1.0 | - | 24 | 1.0 | - | |||
| p for heterogeneity | <0.001 | <0.001 | <0.001 | |||||||||
| (b) Socio-demographic characteristics | ||||||||||||
| Parental educational qualifications above the minimum | At least one parent working full-time (or equivalent) | Family living in urban environment | Child goes to special school or special unit in mainstream school | |||||||||
| % | CRF | 95%CI | % | CRF | 95%CI | % | CRF | 95%CI | % | CRF | 95%CI | |
| North England | 61 | 0.5 | (0.4 to 0.7) | 57 | 0.4 | (0.3 to 0.5) | 88 | 3.9 | (2.3 to 6.8) | 41 | 0.8 | (0.6 to 1.1) |
| West Sweden | 91 | 3.3 | (1.5 to 7.0) | 78 | 1.1 | (0.7 to 1.8) | 70 | 1.2 | (0.8 to 1.9) | 52 | 1.2 | (0.8 to 1.8) |
| Northern Ireland | 51 | 0.3 | (0.2 to 0.5) | 66 | 0.6 | (0.4 to 0.8) | 60 | 0.8 | (0.6 to 1.2) | 58 | 1.5 | (1.1 to 2.2) |
| South East France | 73 | 0.9 | (0.5 to 1.4) | 84 | 1.5 | (0.8 to 2.8) | 52 | 0.6 | (0.4 to 0.9) | 67 | 2.3 | (1.4 to 3.7) |
| South West Ireland | 71 | 0.8 | (0.5 to 1.1) | 78 | 1.1 | (0.7 to 1.7) | 56 | 0.7 | (0.5 to 1.0) | 28 | 0.4 | (0.3 to 0.7) |
| East Denmark | 96 | 6.9 | (2.8 to 17) | 84 | 1.6 | (1.0 to 2.5) | 67 | 1.1 | (0.8 to 1.6) | 54 | 1.3 | (0.9 to 1.9) |
| Central Italy | 80 | 1.2 | (0.8 to 2.1) | 81 | 1.3 | (0.7 to 2.1) | 66 | 1.0 | (0.7 to 1.6) | 7 | 0.1 | (0.0 to 0.2) |
| South West France | 84 | 1.6 | (0.9 to 3.0) | 92 | 3.5 | (1.5 to 7.9) | 61 | 0.8 | (0.5 to 1.3) | 45 | 0.9 | (0.6 to 1.4) |
| North West Germany | 84 | 1.6 | (0.9 to 3.0) | 85 | 1.7 | (0.9 to 3.2) | 55 | 0.7 | (0.4 to 1.0) | 80 | 4.5 | (2.6 to 7.8) |
| All centres | 76 | 1.0 | - | 77 | 1.0 | - | 65 | 1.0 | - | 47 | 1.0 | - |
| p for heterogeneity | <0.001 | <0.001 | <0.001 | <0.001 | ||||||||
| (c) Completion of KIDSCREEN by child | ||||||||||||
| % | CRF | 95%CI | ||||||||||
| North England | 67 | 1.3 | (0.9 to 1.9) | |||||||||
| West Sweden | 55 | 0.8 | (0.5 to 1.2) | |||||||||
| Northern Ireland | 57 | 0.8 | (0.6 to 1.2) | |||||||||
| South East France | 57 | 0.8 | (0.5 to 1.3) | |||||||||
| South West Ireland | 68 | 1.4 | (0.9 to 2.1) | |||||||||
| East Denmark | 70 | 1.5 | (1.0 to 2.2) | |||||||||
| Central Italy | 47 | 0.6 | (0.4 to 0.8) | |||||||||
| South West France | 61 | 1.0 | (0.6 to 1.5) | |||||||||
| North West Germany | 60 | 1.0 | (0.6 to 1.5) | |||||||||
| All centres | 61 | 1.0 | - | |||||||||
| p for heterogeneity | 0.02 | |||||||||||
CRF = Comparative risk function
CRF <1 and >1 indicate proportions below and above the mean respectively; proportions significantly below the mean are show n in bold; proportions significantly above the mean are show n in bold and italics.