Table 1. Main characteristics of the study sample according to participation or missing values.
| Participants N = 449 | Non participants N = 89 | P* | |
|---|---|---|---|
| Age (years) | 81.0 (4.4) | 83.1 (5.4) | 0.0008 |
| Sex (men) | 290 (64.6) | 51 (57.3) | 0.19 |
| Height (m) | 1.65 (0.08) | N = 32 1.64 (0.09) | 0.54 |
| Weight (kg) | 74.6 (14.5) | N = 34 71.4 (14.7) | 0.21 |
| Body Mass Index (kg/m2) | 27.4 (4.3) | N = 30 26.8 (5.0) | 0.45 |
| Mini Mental State Examination | N = 440 24.4 (4.0) | N = 88 20.5 (7.9) | <0.0001 |
| CES-D | N = 396 5.2 (7.2) | N = 57 5.9 (7.8) | 0.48 |
| Instrumental Activities of Daily Living | N = 444 153 (34.5) | 54 (60.7) | <0.0001 |
| Activities of Daily Living | N = 445 33 (7.4) | N = 88 32 (36.4) | <0.0001 |
Data are expressed as means (standard deviations), or n (percentages).
CES-D: Center for Epidemiologic Studies-Depression Scale
*T-test or chi-square or Fisher test as appropriate