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Table3 The comparison of underlying diseases

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
Pulmonary hypertension (n) 11 48 20.974 < 0.001
Obstructive pulmonary disease (n) 5 1 69.467 < 0.001
Bronchiectasis and emphysema (n) 8 2 106.714 < 0.001
Previous history of respiratory failure (n) 7 2 90.254 < 0.001
Hypertension (n) 5 107 0.319 0.572
Diabetes (n) 9 151 0.001 0.978
Bed time (d) 6.92 ± 2.31 6.89 ± 2.42 0.073 0.942
Hypoproteinemia (n) 16 126 11.091 0.001