Table 1 Sociodemographic and (selected) health characteristics of the sample, and the sub-groups for whom blood samples were, and were not taken
Characteristics (number and % unless otherwise stated) | Whole sample (n = 2011) | Blood sample taken (n = 1451) | Blood sample not taken (n = 560) | Statistical test comparing sub-groups with and without blood samples |
|---|---|---|---|---|
Age median (25th and 75th centiles) | 74 (69-80) | 74 (69-81) | 74 (69-80) | Z = -1.46, p = 0.14 |
Female sex | 1324 (65.9%) | 316 (60.0%) | 1008 (68.0%) | X2 = 11.2, p = 0.001 |
Education (MV1 = 19) | ||||
None | 392 (19.7%) | 98 (18.8%) | 294 (20.0%) | X2 = 0.8, p = 0.39 |
Some | 1022 (51.3%) | 268 (51.5%) | 754 (51.2%) | |
Completed primary | 370 (18.6%) | 97 (18.7%) | 273 (18.5%) | |
Secondary or tertiary | 208 (10.5%) | 57 (11.0%) | 151 (10.3%) | |
Living alone | 254 (12.6%) | 79 (15.0%) | 175 (11.8%) | X2 = 3.5, p = 0.06 |
Marital status (MV = 15) | ||||
Never married | 139 (7.0%) | 44 (8.4%) | 95 (6.5%) | X2 = 4.8, p = 0.19, 3 df |
Divorced/separated | 465 (23.1%) | 133 (25.4%) | 332 (22.6%) | |
Widowed | 806 (40.4%) | 198 (37.8%) | 608 (41.3%) | |
Currently married | 586 (29.1%) | 149 (28.45) | 437 (29.7%) | |
Assets | ||||
0-4 | 648 (32.2) | 167 (31.6%) | 481 (32.4%) | X2 = 0.3, p = 0.58 |
5 | 444 (22.1) | 115 (21.8%) | 329 (22.2%) | |
6 | 733 (36.4) | 194 (36.7%) | 539 (36.3%) | |
7 | 186 (9.2%) | 52 (9.8%) | 134 (9.0%) | |
Three or more limiting illnesses (MV = 2) | 465 (23.1%) | 115 (21.8%) | 350 (23.6%) | X2 = 0.7, p = 0.40 |
Depression | 278 (13.8%) | 56 (10.6%) | 222 (15.0%) | X2 = 6.2, p = 0.01 |
Dementia | 235 (11.7%) | 68 (12.9%) | 167 (11.3%) | X2 = 1.0, p = 0.32 |
Systolic blood pressure mean (SD) (MV = 20) | 136.2 (20.1) | 136.3 (20.6) | 136.2 (20.0) | F = 0.56, p = 0.97, 1989 |
Waist circumference mean (SD)(MV = 25) | 92.3 (12.9) | 91.6 (13.6) | 92.5 (12.6) | F = 0.53, p = 0.18, 1984 |