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Table 2 The comparison of operation-related indicators

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

  PRF group (n = 37) Control group (n = 626) t P
Operation duration (min) 82.91 ± 10.69 82.01 ± 10.58 0.503 0.615
Intraoperative blood loss (mL) 198.73 ± 20.38 196.32 ± 19.83 0.717 0.474