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Table 5 The log-rank test for survival length during the different time interval between two groups

From: Long-term survival of femoral neck fracture patients aged over ninety years: Arthroplasty compared with nonoperative treatment

Different Time intervals

Treatment regime

χ2

P

Nonoperative group (\( \overline{x}\pm {s}_d \))

Arthroplasty group (\( \overline{x}\pm {s}_d \))

(0, 30]days

34.78 ± 4.26

62.00 ± 7.04

10.017

0.002*

(0, 1]year

40.01 ± 4.45

57.93 ± 7.18

5.021

0.025*

(1, 2] year

31.56 ± 4.22

62.62 ± 7.45

12.373

< 0.001*

(2, 3] year

33.56 ± 4.49

64.00 ± 7.75

11.100

0.001*

(3, 4] year

30.85 ± 4.30

58.82 ± 7.48

10.048

0.002*

(4, 5] year

30.58 ± 4.35

58.93 ± 7.80

5.021

0.025*

Total

31.36 ± 4.22

73.26 ± 11.65

9.568

0.002*

  1. * P < 0.05 was considered statistically significant