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Table 1 Characteristics of patients aged 35-74 years free of CKD at baseline in the QResearch derivation and the THIN validation cohort.

From: Predicting the risk of Chronic Kidney Disease in Men and Women in England and Wales: prospective derivation and external validation of the QKidney®Scores

  QResearch
derivation cohort
(n = 1,574,749)
THIN
Validation cohort
(n = 1,581,745)
Women 775,091 (49.22) 784005 (49.57)
Mean age(SD) 47.3 (11.1) 49 (11.1)
Mean Townsend deprivation score (SD) -0.5 (3.4) -0.7 (3.1)
Ethnic group   
   white/not recorded 1,511,028 (95.95) 1,548,749 (97.91)
   Indian 12,360 (0.78) 8,313 (0.53)
   Pakistani 6,582 (0.42) 2,370 (0.15)
   Bangladeshi 2,671 (0.17) 797 (0.05)
   Other Asian 5,239 (0.33) 3,652 (0.23)
   Black Caribbean 9,596 (0.61) 4,131 (0.26)
   Black African 10,535 (0.67) 5,224 (0.33)
   Chinese 2,819 (0.18) 1,279 (0.08)
   Other 13,919 (0.88) 7,230 (0.46)
Smoking status   
   non smoker 804,831 (51.11) 641,929 (40.58)
   ex smoker 286,731 (18.21) 236,820 (14.97)
   light smoker 101,273 (6.43) 96,347 (6.09)
   moderate smoker 124,246 (7.89) 153,262 (9.69)
   heavy smoker 100,891 (6.41) 150,036 (9.49)
   smoker amount not recorded 42,309 (2.69) 204,564 (12.93)
   smoking not recorded 114,468 (7.27) 98,787 (6.25)
Clinical conditions   
   Type 1 diabetes 4,441 (0.28) 4,940 (0.31)
   Type 2 diabetes 49,179 (3.12) 49,877 (3.15)
   Cardiovascular disease 70,865 (4.50) 80,977 (5.12)
   Congestive cardiac failure 7,366 (0.47) 8,073 (0.51)
   Peripheral vascular disease 16,015 (1.02) 20,066 (1.27)
   Treated hypertension 156,506 (9.94) 142,192 (8.99)
   Rheumatoid arthritis 11,933 (0.76) 14,137 (0.89)
   Systemic lupus erythematosis 1,094 (0.07) 1,103 (0.07)
   Kidney Stones 10,674 (0.68) 12,115 (0.77)
   Current use of NSAIDS 425,775 (27.04) 387,087 (24.47)
   Family history of kidney disease 719 (0.05) 1,097 (0.07)
Clinical values   
   systolic blood pressure recorded 1,415,467 (89.89) 1,437,893 (90.91)
   mean systolic blood pressure (SD) 133.1 (19.5) 133.6 (19.6)
   body mass index recorded 1,241,158 (78.82) 1,253,686 (79.26)
   mean body mass index (SD) 26.7 (4.7) 26.8 (4.7)
   creatinine recorded ever 880,627 (55.92) 863,948 (54.62)
   mean Creatinine (SD) 86.2 (15.9) 86.3 (16.3)
   creatinine recorded prior to baseline 331,018 (21.02) 217,814 (13.77)
   complete data (for SBP, BMI & smoking) 1,214,906 (77.15) 1,226,974 (77.57)
  1. Values are numbers (%).
  2. Data for the QResearch validation cohort is not shown but is available from the authors.