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Table 1 Baseline characteristics of end-stage renal disease cases and controls in the southern community cohort study

From: Increased body mass index may be associated with greater risk of end-stage renal disease in whites compared to blacks: a nested case–control study

  Overall Whites Blacks
  Cases Controls P Cases Controls P Cases Controls P
  N = 631 N = 1897   66 198   565 1699  
Age 53.8 (9.0) 53.7 (9.0) 0.75 56.6 (7.8) 56.7 (7.8) 0.96 53.5 (9.1) 53.3 (9.0) 0.73
Age Categories    1.00    0.77    1.0
 40–49 243 (38.5) 730 (38.5)   16 (24.2) 47 (23.7)   227 (40.2) 683 (40.2)  
 50–59 228 (36.1) 682 (36.0)   30 (45.5) 83 (41.9)   198 (35.0) 599 (35.3)  
 60–69 124 (19.7) 375 (19.8)   19 (28.8) 60 (30.3)   105 (18.6) 315 (18.5)  
 70–79 36 (5.7) 110 (5.8)   1 (1.5) 8 (4.0)   35 (6.2) 102 (6.0)  
Women 346 (54.8) 1039 (54.8) 0.98 40 (60.6) 120 (60.6) 1.0 306 (54.2) 919 (54.1) 0.98
BMI at age 21 (Kg/m2)    <0.0001    <0.0001    <0.0001
 Underweight 53 (9.0) 214 (11.8)   2 (3.1) 29 (15.0)   51 (9.7) 185 (11.4)  
 Normal 291 (49.4) 1101 (60.5)   28 (43.8) 117 (60.6)   263 (50.1) 984 (60.5)  
 Overweight 131 (22.2) 357 (19.6)   14 (21.9) 33 (17.1)   117 (22.3) 324 (19.9)  
 Obese class I 66 (11.2) 97 (5.3)   11 (17.2) 8 (4.2)   55 (10.5) 89 (5.5)  
 Obese class II 26 (4.4) 27 (1.5)   7 (10.9) 4 (2.1)   19 (3.6) 23 (1.4)  
 Obese class II 22 (3.8) 23 (1.3)   2 (3.1) 2 (1.0)   20 (3.8) 21 (1.3)  
BMI at enrollment (Kg/m2)    0.02    0.14    0.03
 Underweight 7 (1.1) 14 (0.7)   1 (1.5) 1 (0.5)   6 (1.1) 13 (0.8)  
 Normal 141 (22.7) 382 (20.3)   11 (16.9) 47 (24.0)   130 (23.4) 335 (19.9)  
 Overweight 167 (26.9) 553 (29.4)   12 (18.5) 56 (28.6)   155 (27.9) 497 (29.5)  
 Obese class I 111 (17.9) 431 (22.9)   16 (24.6) 48 (24.5)   95 (17.1) 383 (22.7)  
 Obese class II 96 (15.5) 271 (14.4)   13 (20.0) 23 (11.7)   83 (15.0) 248 (14.7)  
 Obese class II 98 (15.8) 230 (12.2)   12 (18.5) 21 (10.7)   86 (15.5) 209 (12.4)  
Diabetes 411 (65.1) 539 (28.5) <0.0001 46 (69.7) 43 (21.7) <0.0001 365 (64.6) 496 (29.2) <0.0001
Hypertension 541 (85.7) 1242 (65.5) <0.0001 52 (78.8) 120 (60.6) 0.007 489 (86.5) 1122(66.1) <0.0001
High Total Cholesterol 315 (50.0) 615 (35.3) <0.0001 43 (66.2) 97 (49.2) 0.02 272 (48.1) 568 (33.6) <0.0001
Education       0.78    0.01
< High school 262 (41.5) 718 (37.9) 0.035 24 (36.4) 72 (36.4)   238 (42.1) 646 (38.0)  
 High school/Vocational training/Junior college 336 (53.3) 1027 (54.1)   33 (50.0) 105 (53.0)   303 (53.6) 922 (54.3)  
 College degree or higher 33 (5.2) 152 (8.0)   9(13.6) 21 (10.6)   24 (4.3) 131 (7.7)  
Income    <0.0001    0.55    <0.0001
  < $15,000 459 (73.7) 1186 (63.1)   48 (72.7) 135 (69.6)   411 (73.8) 1051 (62.4)  
 $15,000–24,999 111 (17.8) 425 (22.6)   11 (16.7) 28 (14.4)   100 (18.0) 397 (23.6)  
  ≥ $25,0000 53 (8.5) 268 (14.3)   7 (10.6) 31 (16.0)   46 (8.3) 237 (14.1)  
Smoking    0.24    0.80    0.14
 Never 218 (34.6) 724 (38.2)   21 (31.8) 55 (27.8)   197 (34.9) 669 (39.5)  
 Former 160 (25.4) 445 (23.5)   19 (28.8) 63 (31.8)   141 (25.0) 382 (22.5)  
 Current 253 (40.1) 724 (38.2)   26 (39.4) 80 (40.4)   227 (40.2) 644 (38.0)  
  1. *P = p-value for univariate comparisons; Data are means (SD) or Frequencies (%)
  2. We used all the data available for each variable to perform the univariate comparisons. We had no missing data for age, race and gender; <1 % missing for BMI at enrollment, diabetes status, hypertension history, income, education and smoking; and 6.7 % missing for BMI at age 21 in cases and 4.1 % in controls