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Table 1 The baseline characteristics

From: Risks of postoperative respiratory failure in elderly patients after hip surgery: a retrospective study

  PRF group (n = 37) Control group (n = 626) χ2/t P
Age (year) 73.03 ± 9.02 73.29 ± 9.09  − 0.169 0.866
Gender (male/female) 21/16 359/267 0.005 0.944
Fracture type     
 Femoral trochanteric fracture 23 296  0.006  0.997
 Femoral neck fracture 14 330   
Position     
 Left 20 355 0.100 0.752
 Right 17 271