Table 1 Comparison of baseline characteristics between patients with no AIS and AIS groups

Age, y (Mean SD)

76.22 ± 6.02

79.19 ± 7.03

< 0.001

Female, n(%)

1263 (51.47)

32 (50.79)

0.97 (0.59–1.61)

0.916

Male, n(%)

1191 (48.53)

31 (49.20)

0.97 (0.59–1.61)

0.916

BMI ≥ 24 kg/m, n(%)

735 (29.95)

21 (33.33)

0.86 (0.50–1.45)

0.563

Current Smoking, n(%)

661 (26.96)

14 (22.22)

0.78 (0.43–1.41)

0.404

Hypertension, n(%)

801 (66.26)

15 (23.81)

0.65 (0.36–1.16)

0.139

Diabetes, n(%)

731 (32.64)

34 (53.97)

2.77 (1.67–4.57)

< 0.001

Hyperlipidemia, n(%)

1477 (60.19)

48 (76.19)

2.11 (1.18–3.80)

0.010

Atrial fibrillation, n (%)

37 (1.51)

5 (7.94)

5.63 (2.14–14.85)

< 0.001

Dementia, n (%)

97 (3.95)

4 (6.35)

1.65 (0.59–4.63)

0.339

Heart disease, n (%)

124 (5.05)

2 (3.17)

0.62 (0.15–2.55)

0.500

Chronic renal disease, n (%)

197 (8.03)

6 (9.52)

1.21 (0.51–2.83)

0.667

Chronic liver disease, n (%)

1054.28)

2 (3.17)

0.73 (0.18–3.04)

0.668

COPD, n (%)

247 (10.07)

7 (11.11)

1.12 (0.50–2.48)

0.786

Anticoagulant use before surgery, n (%)

963 (39.24)

17 (26.98)

0.57 (0.33–1. 00)

0.049

Fracture to operation duration, d (Mean SD)

6.87 ± 3.37

7.84 ± 5.41

0.283

ALB, g/l (Mean SD)

34.097 ± 4.81

33.25 ± 5.14

0.132

RBC, g/l (Mean SD)

135.04 ± 26.34

130.95 ± 26.38

0.229

D-dimer, ug/ml (Mean SD)

3.68 ± 2.19

5.46 ± 2.60

< 0.001