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Table 4 The potential risk factors of PRF in univariate analysis

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

  Wald χ2 P OR (95% CI)
Pulmonary hypertension 6.059 0.012 3.792 (1.421–10.203)
Hypoproteinemia 7.819 0.103 0.765 (0.212–1.231)
Obstructive pulmonary disease 4.782 0.024 1.119 (1.009–1.238)
Bronchiectasis and emphysema 11.029 0.001 4.949 (1.919–9.873)
Previous history of respiratory failure 9.783 0.002 6.098 (2.012–12.198)