Comparative outcomes of proximal femur intramedullary nailing vs. cemented bipolar hemiarthroplasty for treating intertrochanteric fractures in patients aged 75 and older: analysis of risk factors for postoperative all-cause mortality

Table 5 Comparison of mortality rate between two groups of patients at different time periods

Postoperative follow-up timepoint	IF group N1 (N2) (Mortality)	LCHA group N1 (N2) (Mortality)	p.overall
The 3rd month	4(120) (3.3%)	6(121) (5.0%)	0.518^a
The 6th month	8(120) (6.7%)	9(116) (7.8%)	0.746 ^a
The 9th month	8(118) (6.8%)	11(112) (9.8%)	0.402^a
One-year	10(117) (8.5%)	15(111) (13.5%)	0.23^a
Two- year	13(66) (19.7%)	21(86) (24.4%)	0.489^a
Three -year	11(31) (35.5%)	19(58) (32.8%)	0.796^a

Note: N1, number of dead patients; N2, total number of patients; chi-square test

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