Table 1.

Cohort characteristics by CKD category (n=111,087)

CharacteristicsCKD CategoryaOverall, n=111,087
G3A, n=71,347G3B, n=28,020G4, n=8653G5 (Nondialysis), n=1305G5 (Dialysis), n=1762
Demographic characteristics
 Age, yr
  18–6422.612.716.429.548.920.1
  65–7428.720.617.219.922.825.6
  75–8433.638.735.629.622.534.8
  ≥8515.227.930.921.05.819.5
  Mean (SD)73.3 (11.8)77.8 (11.5)77.3 (13.1)72.1 (15.3)63.7 (15.8)74.6 (12.2)
 Women58.059.657.751.241.858.1
 First Nations1.21.31.84.37.41.4
 Urban/rural
  Urban77.576.877.876.281.177.4
  Rural22.423.022.123.618.822.5
  Unknown0.10.20.10.20.10.1
 Neighborhood income quintile (relative to Alberta)
  1 (Lowest)27.329.631.529.629.228.3
  223.224.524.322.625.423.7
  317.417.016.017.816.017.2
  415.013.312.712.311.614.3
  5 (Highest)14.612.712.213.212.913.9
  Unknown2.52.93.34.65.02.7
 Albuminuria
  Normal/mild (A1)62.251.534.814.01.855.9
  Moderate (A2)16.521.825.921.15.418.5
  Severe (A3)3.88.721.944.139.07.4
  Unmeasured17.518.017.320.853.818.2
 Other comorbidities
  Alcohol misuse2.73.24.26.17.63.1
  Asthma4.55.86.24.77.55.0
  Atrial fibrillation13.420.824.018.819.116.3
  Cancer—lymphoma0.81.01.41.62.01.0
  Cancer—metastatic1.62.22.22.92.91.8
  Cancer—nonmetastatic7.27.78.28.97.97.4
  Congestive heart failure14.427.038.234.643.920.2
  Chronic pain11.513.112.610.015.612.0
  Chronic pulmonary disease24.230.635.130.032.526.8
  Chronic viral hepatitis B0.10.10.10.20.80.1
  Cirrhosis0.40.71.00.81.90.6
  Dementia7.512.113.813.06.59.2
  Depression10.210.110.912.013.410.3
  Diabetes26.636.144.849.057.731.1
  Epilepsy1.81.82.42.65.31.9
  Hypertension77.690.293.290.493.782.4
  Hypothyroidism20.623.223.318.515.421.3
  Irritable bowel disease1.51.51.81.82.41.6
  Irritable bowel syndrome3.43.33.43.52.73.4
  Multiple sclerosis0.60.60.50.70.80.6
  Myocardial infarction7.812.015.215.017.89.7
  Parkinson disease0.91.31.31.41.61.0
  Peptic ulcer disease0.40.50.91.01.50.5
  Peripheral vascular disease3.65.97.87.027.94.9
  Psoriasis1.21.41.41.21.11.3
  Rheumatoid arthritis5.16.57.24.17.85.6
  Schizophrenia1.41.41.51.91.61.4
  Stroke16.923.527.024.725.319.6
 Total no. of chronic conditions, mean (SD)2.8 (2.0)3.8 (2.2)4.6 (2.3)4.5 (2.2)5.2 (2.4)3.3 (2.2)
 Total no. of chronic conditions (excluding CKD), mean (SD)2.7 (1.9)3.4 (2.0)3.9 (2.1)3.7 (2.1)4.2 (2.4)3.0 (2.0)
Primary care use in 2 yr before index
 No. of GP visits in 2 yr before index
  0–726.020.120.328.747.724.5
  8–2051.249.645.443.735.950.0
  >2022.730.334.427.716.525.5
  Median (25th, 75th percentile)12 (7, 19)14 (9, 23)15 (9, 25)13 (6, 22)8 (3, 16)13 (8, 21)
 GP continuity
  Low (<50% with same GP)8.88.28.411.611.18.7
  Medium (50% to <75% with same GP)24.423.523.323.421.024.0
  High (≥75% with same GP)62.163.862.855.245.462.2
  Less than three GP visits (continuity not defined)4.74.55.59.822.55.1
 At least one visit with a nephrologist in prior 2 yr3.211.636.863.999.710.2
  • GP, general practitioner.

  • a Percentage unless otherwise indicated.