Table 1 Demographic characteristics at different health systems.

N

153,821

100,819

86,264

57,286

19,542

88,865

   18–25

7819 (5.1)

4879 (4.8)

4223 (4.9)

3193 (5.6)

1172 (6)

1978 (2.2)^***

   26–35

12,908 (8.4)

8344 (8.3)

7438 (8.6)

4819 (8.4)

2,007 (10.3)

3218 (3.6)^***

   36–45

15,533 (10.1)

10,401 (10.3)

8315 (9.6)

6150 (10.7)

2132 (10.9)

4724 (5.3)^***

   46–55

26,104 (17)

15,658 (15.5)^**

13,566 (15.7)^*

10,517 (18.4)

4184 (21.4)^***

9885 (11.1)^***

   56–65

36,433 (23.7)

22,373 (22.2)^**

18,768 (21.8)^***

13,077 (22.8)

5940 (30.4)^***

15,564 (17.5)^***

   ≥66

55,024 (35.8)

39,164 (38.8)^***

33,954 (39.4)^***

19,533 (34.1)^**

4107 (21)^***

53,496 (60.2)^***

   Female

75,962 (49.4)

52,885 (52.5)^***

42,894 (49.7)

29,556 (51.6)^***

8655 (44.3)^***

43,748 (49.2)

   Male

77,857 (50.6)

47,934 (47.5)^***

43,370 (50.3)

27,730 (48.4)^***

10,887 (55.7)^***

45,117 (50.8)

   White

114,312 (74.3)

64,839 (64.3)^***

70,741 (82)^***

50,499 (88.1)^***

14,505 (74.2)

81,282 (91.5)^***

   Black

24,046 (15.6)

21,195 (21)^***

9014 (10.4)^***

5069 (8.8)^***

3578 (18.3)^**

362 (0.4)^***

   Asian

1,416 (0.9)

1,927 (1.9)

711 (0.8)

247 (0.4)

299 (1.5)

460 (0.5)

   Native American

594 (0.4)

198 (0.2)

863 (1)

0 (0)

75 (0.4)

817 (0.9)

   Other

13,338 (8.7)

5200 (5.2)^***

4716 (5.5)^***

294 (0.5)^***

998 (5.1)^***

433 (0.5)^***

   Unknown

115 (0.1)

7460 (7.4)^***

219 (0.3)

1180 (2.1)^**

87 (0.4)

5511 (6.2)^***

   Yes

8531 (5.5)

11,636  (11.5)^***

4284 (5)

227 (0.4)^***

889 (4.5)

1001 (1.1)^***

   No

144,262 (93.8)

84,958 (84.3)^***

81,748 (94.8)^***

0 (0)^***

18,546 (94.9)^***

81,789 (92)^***

   Unknown

1028 (0.7)

4225 (4.2)^***

232 (0.3)

57,062 (99.6)^***

107 (0.5)

6075 (6.8)^***

   Non-AKI

129,230 (84.0)

85,644 (84.9)^***

73,172 (84.8)^***

51,513 (89.9)^***

16,579 (84.8)^**

76,370 (85.9)^***

   Any AKI

23,267 (16.0)

15,175 (15.1)^***

13,092 (15.2)^***

5773 (10.1)^***

2963 (15.2)^**

12,495 (14.1)^***

   AKI Stage ≥2

3216 (2.1)

2973 (2.9)^***

2551 (3.0)^***

1173 (2.0)

620 (3.2)^***

1416 (1.6)^***

   AKI Stage 3

1562 (1.0)

1655 (1.6)^***

1441 (1.7)^***

644 (1.1)^*

366 (1.9)^***

577 (0.6)^***