Table 1.

Patient characteristics

CharacteristicAll PatientsPatients without CKDPatients with CKD
Demographic
 Patients, n (%)536,549 (100)490,816 (91.5)45,733 (8.5)
 Mean age ±SD, yr52.4±22.850.6±22.572.1±15
 Men, %49.349.843.9
Most responsible diagnosis category, %
 Disease of digestive system13.914.211.1
 Injury, poisoning13.5148.1
 Disease of circulatory system12.71220.8
 Neoplasm9.59.411.4
 Disease of musculoskeletal system9.29.110.3
 Disease of genitourinary system9.29.19.6
 Disease of respiratory system8.88.97.6
 Mental behavioral6.97.23.1
 Symptom, signs of abnormal clinical and laboratory result5.85.85.8a
 Endocrine3.43.25
 Disease of nervous system2.42.42.2
 Certain infectious and parasitic disease1.51.61.6a
 Disease of skin and subcutaneous tissue1.21.21.1a
 Disease of eye0.90.91a
 Disease of blood and blood-forming organs0.70.71.9
 Disease of ear0.40.40.3
Admissions
 Urgent admission, %69.769.671
 Medical, n (%)228,450 (42.6)208,926 (42.6)19,524 (42.7)
 Surgical, n (%)172,636 (32.2)156,361 (31.8)16.275 (35.6)
 Other, n (%)135,463 (25.2)125,529 (25.6)9,934 (21.7)
Length of stay, db7.4 (3 [2–7])7.1 (3 [2–6])10.6 (4[ 2–11])
HACs, n (%)
 Any aHAC5419 (1)4711 (0.9)722 (1.6)
 Any pHAC30851 (5.7)263,568 (5.4)4490 (9.8)
 Any HAC42,036 (7.8)351,65 (7.2)5,911 (12.9)
 Medical admission with any HAC16,194 (7.1)13,038 (6.7)2256 (11.6)
 Surgical admission with any HAC16,540 (9.6)14,113 (9)2427 (14.9)
 Other admission with any HAC9302 (6.9)8014 (6.4)1288 (13)
eGFR, n (%)500,199 (93.2)500,199 (93.2)0
 ≥60 ml/min per 1.73 m2
 45–59 ml/min per 1.73 m222,736 (4.2)022,736 (4.2)
 30–44 ml/min per 1.73 m29402 (1.7)09402 (1.7)
 15–29 ml/min per 1.73 m24212 (0.8)04212 (0.8)
Proteinuria522,613 (97.4)522,613 (97.4)0
 None (<3 mg/mmol)
 Moderate (3–30 mg/mmol)8341 (1.5)08341 (1.5)
 Heavy (>30 mg/mmol)5595 (1)05595 (1)
  • In patients with CKD, mean serum creatinine±SD) was 122.95±105 μmol/L and mean eGFR was 49.39±15.54 ml/min per 1.73 m2. HAC, hospital-acquired complication; aHAC, always preventable hospital-acquired complication; pHAC, potentially preventable hospital-acquired complication.

  • a Not statistically significant.

  • b Expressed as mean (median [25th–75th percentiles]).