Table 1.

Characteristics of patients

CharacteristicNo HA-AKIHA-AKIAKIN1AKIN2AKIN3
Individuals, n (%)118,257 (92)8479 (8)5961 (70)806 (10)1712 (20)
Age, yr61 (47–74)71 (58–83)73 (59–84)69 (57–81)66 (54–78)
Sex ratio, M/F1.181.661.571.442.23
eGFR at admission, n (%)
 <15 ml/min per 1.73 m21558 (1.5)1118 (13)192 (3)0926 (54)
 15–29 ml/min per 1.73 m24311 (3.5)1180 (14)830 (14)7 (0.8)343 (34)
 30–59 ml/min per 1.73 m220,842 (17.5)2668 (31)2223 (37)260 (32)185 (11)
 60–89 ml/min per 1.73 m245,246 (38)2134 (25)1689 (28)315 (40)130 (7.5)
 >90 ml/min per 1.73 m245,873 (39)1379 (16)1027 (17)224 (28)128 (7.5)
Intensive care unit, n (%)12,072 (10)3976 (46)2641 (44)548 (67)787 (45)
Length of stay, d2 (0–7)10 (5–18)10 (5–15)12 (6–23)8 (3–18)
In-hospital mortality, n (%)2800 (2.4)2062 (25)1212 (20)334 (41)516 (30)
 In ICU1528 (13)1573 (40)875 (33)279 (51)419 (53)
 Not in ICU1272 (1.2)489 (11)337 (10)55 (21)97 (10)
  • Categoric variables are presented as n (%), and continuous variables are presented as the mean and interquartile range. AKI was diagnosed on the basis of two plasma creatinine measurements (in the 24 h and 7 d after admission), and the severity was classified according to the AKIN stages. AKIN1: 1.5–2-fold plasma creatinine increase from baseline; AKIN2: >2–3-fold plasma creatinine increase from baseline; AKIN3: >3-fold plasma creatinine increase from baseline, or plasma creatinine >4 mg/dl with an acute increase of at least 0.5 mg/dl, or need for RRT. HA-AKI, hospital-acquired AKI; AKIN, Acute Kidney Injury Network; M/F, Male/Female; ICU, Intensive Care Unit.