Table 3 Comparison of person characteristics between respondents and non-respondents
Respondents | Non-respondents | Difference | |
|---|---|---|---|
2005 | |||
Age (mean; SD) | 49.5 (16.5) | 43.5 (16.2) | F = 1035.92*** |
Sex (% male) | 52 | 61 | χ2 = 240.44*** |
2006 | |||
Age (mean; SD) | 50.7 (16.6) | 44.0 (16.8) | F = 824.35*** |
Sex (% male) | 47 | 55 | χ2 = 107.78*** |
2007 | |||
Age (mean; SD) | 51.8 (16.9) | 45.0 (17.0) | F = 883.50*** |
Sex (% male) | 44 | 53 | χ2 = 165.72*** |
2008 | |||
Age (mean; SD) | 49.1 (18.0) | 47.0 (16.7) | F = 72.76*** |
Sex (% male) | 51 | 50 | χ2 < 1, ns |