Table 1. Characteristics of initial cohort, at commencement of RRTa

CharacteristicUnderweight (BMI of <20 kg/m2) (n = 1127)Normal Weight (BMI of 20 to 24 kg/m2) (n = 3771)Overweight (BMI of 25 to 29 kg/m2) (n = 2937)Obese (BMI of ≥30 kg/m2) (n = 1605)
The proportions in each body mass index (BMI) category were compared with a chi-squared test, or ANOVA (for continuous variables).
a RRT, renal replacement therapy; IQR, interquartile range; CI, confidence interval.
b P < 0.001.
c P < 0.01.
No. (% of all new RRT patients)b1127/2501 (45%)3771/7499 (50%)2937/5775 (51%)1605/2261 (71%)
Age (yr) (median, IQR)59 (40 to 70)61 (47 to 70)62 (51 to 69)58 (49 to 66)
Maleb392 (35%)2053 (54%)1755 (60%)711 (44%)
New Zealandb160 (14%)780 (21%)780 (27%)562 (35%)
Australian Aboriginal55 (5%)186 (5%)185 (6%)138 (9%)
Maori/Pacific Islanderb44 (4%)255 (7%)459 (16%)448 (28%)
Diabetes mellitusb
    type I55 (5%)275 (7%)175 (6%)59 (4%)
    type II160 (14%)784 (21%)1068 (36%)829 (52%)
Coronary artery diseaseb397 (35%)1507 (40%)1311 (45%)723 (45%)
Cerebrovascular disease173 (15%)642 (17%)475 (16%)236 (15%)
Peripheral vascular diseaseb297 (26%)1083 (29%)973 (33%)522 (33%)
Chronic lung diseasec211 (19%)591 (16%)428 (15%)248 (15%)
Hypertension at RRT startb842/1034 (81%)2999/3500 (86%)2409/2747 (88%)1336/1520 (88%)
Current smokingb184 (16%)509 (14%)337 (11%)169 (11%)
Height (cm) (median, IQR)163 (157 to 170)166 (160 to 174)166 (160 to 173)163 (157 to 170)
Weight (kg) (median, IQR)b49 (45 to 54)63 (57 to 69)75 (69 to 82)89 (81 to 98)
Deaths (n = 3296 with BMI recorded at RRT start)3951316991594
Death rate per 100 person-years (95% CI)b17.2 (15.6 to 19.0)18.4 (17.4 to 19.4)18.6 (17.4 to 19.8)21.3 (19.6 to 23.0)
Cardiovascular deaths194 (49%)705 (54%)576 (58%)363 (61%)