Variable (at enrolment) | Non-cases (N=55 260) N (%) | ESRD cases (N=320) N (%) | HR (95% CI) |
---|---|---|---|
State (where enrolled)* | |||
Iowa | 35 943 (65.0) | 134 (41.9) | |
North Carolina | 19 317 (35.0) | 186 (58.1) | 2.02 (1.61 to 2.53) |
Applicator type* | |||
Private | 50 575 (91.5) | 308 (96.3) | |
Commercial | 4685 (8.5) | 12 (3.7) | 0.75 (0.42 to 1.35) |
Age category (years) | |||
18–30 | 6306 (11.4) | 12 (3.8) | |
31–49 | 27 380 (49.6) | 58 (18.1) | 1.15 (0.62 to 2.15) |
50–69 | 18 924 (34.3) | 210 (65.6) | 6.04 (3.38 to 10.81) |
≥70 | 2650 (4.8) | 40 (12.5) | 10.04 (5.25 to 19.20) |
Race | |||
Caucasian | 52 763 (97.3) | 273 (85.3) | |
Other | 1440 (2.7) | 47 (14.7) | 4.42 (3.18 to 6.13) |
Education level | |||
High school or less | 30 495 (57.6) | 230 (75.7) | |
More than high school | 22 452 (42.4) | 74 (24.3) | 0.65 (0.50 to 0.85) |
Number years lived or worked on a farm† | |||
0–20 | 2181 (10.0) | 10 (7.9) | |
21–30 | 2928 (13.4) | 13 (10.2) | 1.43 (0.62 to 3.28) |
>30 | 16 668 (76.5) | 104 (81.9) | 0.90 (0.46 to 1.75) |
Number of days per month drink alcohol in the last year | |||
0 | 16 504 (31.9) | 147 (52.1) | |
1–23 | 31 833 (61.5) | 121 (42.9) | 0.86 (0.66 to 1.11) |
≥24 | 3447 (6.7) | 14 (5.0) | 0.78 (0.45 to 1.36) |
Number of pack-years smoked | |||
None | 28 059 (53.8) | 124 (43.5) | |
1–11 | 10 956 (21.0) | 45 (15.8) | 0.80 (0.57 to 1.13) |
12–30 | 8708 (16.7) | 67 (23.5) | 1.23 (0.91 to 1.66) |
>30 | 4464 (8.6) | 49 (17.2) | 1.36 (0.97 to 1.91) |
Body mass index (kg/m2) | |||
<25 | 9658 (25.5) | 44 (19.8) | |
25–29.99 | 19 341 (51.1) | 108 (48.6) | 1.26 (0.89 to 1.79) |
≥30 | 8823 (23.3) | 70 (31.5) | 2.00 (1.37 to 2.93) |
Self-reported doctor diagnosis of | |||
Diabetes | |||
No | 49 616 (97.2) | 192 (70.1) | |
Yes | 1411 (2.8) | 82 (29.9) | 8.78 (6.72 to 11.45) |
High blood pressure† | |||
No | 20 081 (83.6) | 52 (39.4) | |
Yes | 3945 (16.4) | 80 (60.6) | 4.66 (3.25 to 6.68) |
Kidney disease (not counting kidney stones) | |||
No | 50 935 (99.2) | 245 (88.4) | |
Yes | 415 (0.8) | 32 (11.6) | 10.35 (7.14 to 15.02) |
*Adjusted for age only.
†Reported on the take-home questionnaire only.
ESRD, end-stage renal disease.