Table 2 Characteristics and outcomes of included participants according to Acute Kidney Injury stage

Age, years

82.6

[75.2 to 87.9]

85.0

[78.6 to 89.8]

85.5

[78.6 to 89.9]

84.3

[78.5 to 89.6]

83.9

[77.4 to 88.9]

<0.001

Male

562

(26.0)

214

(31.3)

154

(31.9)

38

(27.9)

22

(34.4)

<0.001

Number (%) with known baseline SCr

1587

(73.3)

457

(66.9)

342

(70.8)

75

(55.0)

40

(62.5)

0.001

Baseline eGFR mls/min/1.73 m²

64

[50 to 77]

57

[43 to 74]

57

[42 to 72]

63

[48 to 72]

58

[37 to 81]

<0.001

CKD stage > =3

658/1587

(41.5)

243/457

(53.1)

186/342

(54.3)

36/75

(48)

21/40

(52.5)

<0.001

Diabetes

266

(12.3)

127

(18.6)

84

(17.4)

28

(20.7)

15

(23.4)

<0.0001

Previous Stroke or TIA

271

(11.9)

104

(15.2)

72

(14.9)

19

(14.1)

13

(20.3)

0.069

Cardiovascular disease

1157

(52.8)

438

(64.1)

301

(62.3)

92

(68.1)

45

(70.3)

<0.0001

Greater than one defined co-morbidity

658

(30.3)

301

(44.1)

205

(42.4)

61

(45.2)

35

(54.7)

<0.0001

Admission AMTS <7

743

(34.3)

244

(35.7)

171

(35.4)

49

(36.3)

24

(37.5)

0.5

Admission haemoglobin < 100 g L^-1

154

(7.1)

61

(8.9)

49

(10.1)

8

(5.8)

4

(6.3)

0.13

Not admitted from home

441

(20.3)

90

(18.6)

32

(23.5)

9

(14)

131

(19.2)

0.51

Nottingham Hip Fracture Score

4

[3–5]

5

[4–6]

5

[4–6]

5

[4–6]

5

[4–6]

<0.0001

Nottingham Hip Fracture Score > = 4

1544

(71.3)

583

(85.4)

414

(83.1)

113

(83.1)

56

(87.5)

<0.0001

Nottingham Hip Fracture Score > = 5

1044

(48.2)

417

(61.1)

302

(62.5)

75

(66.4)

40

(62.5)

<0.001