Table 6 The balance test of PSM (N = 1264)

Age (year)

83.38 ± 4.42

81.99 ± 6.35

0.2544

 < 0.0001*

Gender

0.0559

0.3503

 Male

223 (35.3)

240 (38)

 Female

409 (64.7)

392 (62)

Injury mechanism

0.4958

 Falling

618 (97.8)

620 (98.1)

0.0223

 Accident

10 (1.6)

6 (0.9)

0.0566

 Other

4 (0.6)

6 (0.9)

0.0357

Fracture classification

0.0598

 Intertrochanteric fracture

445 (70.4)

473 (74.8)

0.0995

 Femoral neck fracture

181 (28.6)

148 (23.4)

0.1192

 Subtrochanteric fracture

6 (0.9)

11 (1.7)

0.0687

aCCI

 < 0.0001*

 2

0 (0)

6 (0.9)

0.1385

 3

19 (3)

67 (10.6)

0.3051

 4

278 (44)

273 (43.2)

0.016

 5

235 (37.2)

191 (30.2)

0.1477

 6

82 (13)

73 (11.6)

0.0434

 7

16 (2.5)

18 (2.8)

0.0196

 8

2 (0.3)

4 (0.6)

0.0461

CHD

0.0032

1

 No

282 (44.6)

283 (44.8)

 Yes

350 (55.4)

349 (55.2)

Arrhythmia

0.0265

0.6803

 No

405 (64.1)

413 (65.3)

 Yes

227 (35.9)

219 (34.7)

Ischemic stroke

0.0169

0.8102

 No

424 (67.1)

429 (67.9)

 Yes

208 (32.9)

203 (32.1)

Cancer

0.0563

0.3911

 No

610 (96.5)

603 (95.4)

 Yes

22 (3.5)

29 (4.6)

Dementia

0.0957

0.1146

 No

603 (95.4)

589 (93.2)

 Yes

29 (4.6)

43 (6.8)

COPD

0.0186

0.826

 No

589 (93.2)

586 (92.7)

 Yes

43 (6.8)

46 (7.3)

Virus hepatitis

0.0079

1

 No

606 (95.9)

605 (95.7)

 Yes

26 (4.1)

27 (4.3)

Treatment strategy

0.086

 ORIF

441 (69.8)

476 (75.3)

0.1243

 HA

189 (29.9)

154 (24.4)

0.1248

 THA

2 (0.3)

2 (0.3)

0

Transfusion (U)

0.7442

 0

289 (45.7)

276 (43.7)

0.0414

 1

2 (0.3)

2 (0.3)

0

 2

297 (47)

307 (48.6)

0.0317

 3

0 (0)

2 (0.3)

0.0797

 4

41 (6.5)

43 (6.8)

0.0127

 6

3 (0.5)

2 (0.3)

0.0252

Time to operation (d)

4.45 ± 2.54

4.51 ± 2.83

0.0241

0.6681

Operation time (mins)

91.46 ± 34.62

92.23 ± 33.66

0.0227

0.6865

Infusion (mL)

1506.57 ± 347.69

1512.25 ± 372.73

0.0158

0.7794

Stay in hospital (d)

9.02 ± 3.64

9.05 ± 3.45

0.0094

0.8678