Table 1.
Baseline characteristics of the study population by presence of CVD (coronary artery disease and/or cerebrovascular disease and/or peripheral vascular disease) at baselinea
| Characteristic | No CVD |
CVD |
||||
|---|---|---|---|---|---|---|
| PD (n = 3323) | HD (n = 8902) | P Value | PD (n = 3198) | HD (n = 9164) | P Value | |
| Age (yr) | 57.2 (44.6 to 68.5) | 53.7 (41.4 to 65.9) | <0.001 | 67.4 (58.8 to 74.0) | 67.2 (57.4 to 74.7) | 0.79 |
| Women | 1701 (51%) | 3751 (42%) | <0.001 | 1305 (41%) | 3239 (35%) | <0.001 |
| Race | ||||||
| nonindigenous | 2828 (85%) | 7277 (82%) | <0.001 | 2627 (82%) | 7406 (81%) | <0.001 |
| Aboriginal/Torres Strait Islander | 138 (4%) | 717 (8%) | 146 (5%) | 783 (9%) | ||
| Maori/Pacific Islander | 357 (11%) | 908 (10%) | 425 (13%) | 975 (11%) | ||
| BMI (kg/m2) | ||||||
| underweight (<18.5) | 139 (4%) | 409 (5%) | <0.001 | 86 (3%) | 309 (3%) | <0.001 |
| normal (18.5 to <25) | 1392 (42%) | 3498 (39%) | 1192 (37%) | 3276 (36%) | ||
| overweight (25 to <30) | 1105 (33%) | 2746 (31%) | 1192 (37%) | 2931 (32%) | ||
| obese (≥30) | 685 (21%) | 2221 (25%) | 716 (22%) | 2574 (28%) | ||
| Late referral | 512 (15%) | 2553 (29%) | <0.001 | 520 (16%) | 2627 (29%) | <0.001 |
| Current smoker | 446 (13%) | 1269 (14%) | 0.23 | 378 (12%) | 1246 (14%) | 0.01 |
| Chronic lung disease | 260 (8%) | 840 (9%) | 0.01 | 646 (20%) | 2212 (24%) | <0.001 |
| Coronary artery disease | – | – | – | 2548 (80%) | 7417 (81%) | 0.12 |
| Peripheral vascular disease | – | – | – | 1742 (54%) | 4796 (52%) | 0.04 |
| Cerebrovascular disease | – | – | – | 1039 (33%) | 2753 (30%) | 0.01 |
| Diabetes mellitus | 912 (27%) | 2259 (25%) | 0.02 | 1769 (55%) | 4944 (54%) | 0.18 |
| New Zealand residence | 779 (23%) | 1491 (17%) | <0.001 | 843 (26%) | 1358 (15%) | <0.001 |
| Era | ||||||
| 1997 to 1999 | 763 (23%) | 2106 (24%) | 0.36 | 840 (26%) | 1965 (21%) | <0.001 |
| 2000 to 2002 | 885 (27%) | 2408 (27%) | 924(29%) | 2371 (26%) | ||
| 2003 to 2005 | 984 (27%) | 2664 (30%) | 843 (26%) | 2769 (30%) | ||
| 2006 to 2007 | 691 (21%) | 1724 (19%) | 591 (18%) | 2059 (22%) | ||
| Center size (number of patients) | ||||||
| small (<360) | 611 (18%) | 2380 (27%) | <0.001 | 644 (20%) | 2514 (27%) | <0.001 |
| small to medium (360 to 699) | 757 (23%) | 2136 (24%) | 744 (23%) | 2364 (26%) | ||
| medium to large (700 to 839) | 853 (26%) | 1902 (21%) | 823 (26%) | 1926 (21%) | ||
| large (≥840) | 1102 (33%) | 2484 (28%) | 987 (31%) | 2360 (26%) | ||
| Never change modality | 2203 (66%) | 7028 (79%) | <0.001 | 2185 (68%) | 7054 (77%) | <0.001 |
a
Results are expressed as median (interquartile range) or number (%).