Table 2.

Baseline characteristics of the study population (n = 3702)a

VariableTotal Population (n = 3702)Breakdown by Transport Category
Low (n = 185)Low-Average (n = 1055)High Average (n = 1848)High (n = 614)Crude P Value
Male gender1996 (53.9%)82 (44.3%)518 (49.1%)1050 (56.8%)46 (56.4%)< 0.001
Racial origin
    white2603 (70.3%)128 (69.2%)749 (71.0%)1297 (70.2%)429 (69.9%)
    Aboriginal/TSI197 (5.3%)9 (4.9%)62 (5.9%)83 (4.5%)43 (7.0%)
    < Maori/PI510 (13.8%)24 (13.0%)128 (12.1%)259 (14.0%)99 (16.1%)
    Asian331 (8.9%)22 (11.9%)95 (9.0%)179 (9.7%)35 (5.7%)
    other61 (1.6%)2 (1.1%)21 (2.0%)30 (1.6%)8 (1.3%)0.029
Age (yr)59.4 ± 14.857.5 ± 14.059.4± 14.959.3± 14.859.3 ± 14.60.447
Smoking
    current479 (12.9%)26 (14.1%)114 (10.8%)243 (13.1%)96 (15.6%)
    former1441 (38.9%)60 (32.4%)412 (39.1%)725 (39.2%)244 (39.7%)
    never1782 (48.1%)99 (53.5%)529 (50.1%)880 (47.6%)274 (44.6%)0.040
Hypertension3329 (89.9%)162 (87.6%)949 (90.0%)1663 (90.0%)555 (90.4%)0.731
Lung disease471 (12.7%)28 (15.1%)126 (11.9%)234 (12.7%)83 (13.5%)0.593
Coronary disease1421 (38.4%)72 (38.9%)385 (36.5%)722 (39.1%)242 (39.4%)0.520
Peripheral vascular disease945 (25.5%)41 (22.2%)266 (25.2%)481 (26.0%)157 (25.6%)0.705
Cerebrovascular disease522 (14.1%)20 (10.8%)129 (12.2%)277 (15.0%)96 (15.6%)0.069
Diabetes1410 (38.1%)69 (37.3%)399 (37.8%)690 (37.3%)252 (41.0%)0.424
BMI (kg/m2)26.3 ± 5.226.7 ± 5.226.9 ± 5.326.2 ± 5.125.6 ± 5.2< 0.001
BMI category
    <18.5 kg/m2123 (3.4%)6 (3.2%)34 (3.2%)59 (3.2%)24 (3.9%)
    18.5 to 24.9 kg/m21528 (41.8%)65 (35.1%)391 (37.1%)780 (42.2%)292 (47.6%)
    25 to 30 kg/m21230 (33.7%)65 (35.1%)394 (37.3%)582 (31.5%)189 (30.8%)
    >30 kg/m2773 (21.2%)48 (25.9%)226 (21.4%)399 (21.6%)100 (16.3%)< 0.001
Residual renal function(L/wk per 1.73 m2)22.1 ± 35.519.8 ± 30.622.6 ± 34.222.4 ± 35.621.1 ± 38.60.689
Weekly peritoneal Kt/V2.1 ± 0.72.1 ± 0.72.1 ± 0.72.1 ± 0.72.2 ± 0.80.162
Received APD1231 (33.3%)52 (28.1%)295 (28.0%)641 (34.7%)243 (39.6%)< 0.001
D:P Cr 4 h0.69 ± 0.120.42 ± 0.080.59 ± 0.040.72 ± 0.050.88 ± 0.08< 0.001
  • a Results are expressed as mean ± SD or n (%). Differences between transport categories were assessed by χ2 test or ANOVA, depending on data type. TSI, Torres Strait Islanders; PI, Pacific Islanders; APD, ambulatory peritoneal dialysis.