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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 intervalsTreatment regimeχ2P
Nonoperative group (\( \overline{x}\pm {s}_d \))Arthroplasty group (\( \overline{x}\pm {s}_d \))
(0, 30]days34.78 ± 4.2662.00 ± 7.0410.0170.002*
(0, 1]year40.01 ± 4.4557.93 ± 7.185.0210.025*
(1, 2] year31.56 ± 4.2262.62 ± 7.4512.373< 0.001*
(2, 3] year33.56 ± 4.4964.00 ± 7.7511.1000.001*
(3, 4] year30.85 ± 4.3058.82 ± 7.4810.0480.002*
(4, 5] year30.58 ± 4.3558.93 ± 7.805.0210.025*
Total31.36 ± 4.2273.26 ± 11.659.5680.002*
  1. * P < 0.05 was considered statistically significant