Table 1 Baseline characteristics of patients grouped by the status of 1-year survival for unmatched and PSM population

Demographic characteristics

  Sex(female)

330 (68.8%)

51 (73.9%)

279 (67.9%)

0.317

51 (73.9%)

53 (76.8%)

0.693

  Age(years)

74.93 ± 10.10

82.78 ± 7.49

73.62 ± 20.16

 < 0.001

82.78 ± 7.49

81.65 ± 9.11

0.343

  BMI (kg/m2)

23.00 ± 3.88

23.31 ± 3.32

22.94 ± 3.97

0.490

23.31 ± 3.32

23.22 ± 4.13

0.845

  Residence (rural)

26 (5.4%)

3 (4.3%)

23 (5.6%)

0.891

3 (4.3%)

4 (5.8%)

 > 0.999

  Fractures history (yes)

80 (16.7%)

13 (18.8%)

67 (16.3%)

0.601

13 (18.8%)

11 (15.9%)

0.653

  Smoking history (yes)

41 (8.5%)

5 (7.2%)

36 (8.8%)

0.677

5 (7.2%)

8 (11.6%)

0.382

  Alcoholism history(yes)

15 (3.1%)

3 (4.3%)

12 (2.9%)

0.797

3 (4.3%)

3 (4.3%)

 > 0.999

  Position of fracture(right)

223 (46.5%)

29 (42.0%)

194 (47.2%)

0.425

29 (42.0%)

25 (36.2%)

0.485

Surgery-related variables

  Location of fracture(transcervical)

236 (49.2%)

29 (42.0%)

207 (50.4%)

0.200

29 (42.0%)

29 (42.0%)

 > 0.999

  Surgical procedures(arthroplasty)

177 (36.9%)

29 (42.0%)

148 (36.0%)

0.338

29 (42.0%)

30 (43.5%)

0.863

  Anesthesia (spinal)

4 (0.8%)

1 (1.4%)

3 (0.7%)

0.464

1 (1.4%)

1 (1.4%)

 > 0.999

  Time from injury to surgery (Days)

5.74 ± 6.11

6.16 ± 5.00

5.67 ± 6.28

0.135

6.16 ± 5.00

5.78 ± 3.33

0.955

  CCI score (> 4)

99 (20.6%)

20 (29.0%)

79 (29.2%)

0.064

20 (29.0%)

21 (30.4%)

0.852

  Electrocardiogram (abnormal)

278 (57.9%)

42 (60.9%)

236 (57.4%)

0.591

42 (60.9%)

45 (65.2%)

0.597

  Chest radiograph (abnormal)

228 (48.1%)

41 (59.4%)

187 (45.5%)

0.032

41 (59.4%)

40 (58.0%)

0.863

  Gout (yes)

77 (16.0%)

29 (42.0%)

48 (11.7%)

 < 0.001

29 (42.0%)

28 (40.6%)

0.863

  Hypertension(yes)

239 (49.8%)

47 (68.1%)

192 (46.7%)

0.001

47 (58.1%)

46 (66.7%)

0.856

  Polytrauma(yes)

67 (14.0%)

9 (13.0%)

58 (14.1%)

0.813

9 (13.0%)

7 (10.1%)

0.595

Laboratory findings

  Hb (g/L)

115.11 ± 20.66

109.51 ± 22.77

116.06 ± 20.16

0.005

109.51 ± 22.77

112.64 ± 20.21

0.310

  INR

1.04 ± 0.12

1.04 ± 0.07

1.04 ± 0.12

0.287

1.04 ± 0.07

1.05 ± 0.13

0.524

  GLU (mmol/L)

6.93 ± 3.55

7.04 ± 2.90

6.92 ± 3.65

0.674

7.04 ± 2.90

7.53 ± 6.39

0.623

  ALB (g/L)

38.32 ± 4.34

37.01 ± 4.47

38.54 ± 4.25

0.008

37.01 ± 4.67

37.23 ± 3.60

0.716

  UA (umol/l)

265.13 ± 87.56

273.79 ± 119.07

263.67 ± 81.18

0.975

273.79 ± 119.07

308.73 ± 108.88

0.060

  RBP (mg/L)

27.73 ± 13.42

25.17 ± 10.31

28.41 ± 10.41

0.018

25.17 ± 10.32

30.20 ± 12.08

0.013