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Table 4 Unadjusted, all variables adjusted, and all variables and propensity score-adjusted Association of American Society of Anesthesiologists Physical Status (ASA-PS)

From: Effect of the preoperative physical status on postoperative nausea and vomiting risk: a matched cohort study

    HR (95% CI) ASA PS 1 vs. 2 P value HR (95% CI) ASA PS 1 vs. 3 P value HR (95% CI) ASA PS 2 vs. 3 P value
Original data analysis PONV Unadjusted 0.97 (0.93–1.01) 0.09 0.79 (0.74–0.85) < 0.001 0.87 (0.82–0.92) < 0.001
AV adjusted 0.96 (0.93–1.0) 0.07 0.76 (0.71–0.82) < 0.001 0.86 (0.82–0.91) < 0.001
AVP adjusted 0.96 (0.93–1.0) 0.07 0.76 (0.71–0.82) < 0.001 0.86 (0.82–0.91) < 0.001
PV Unadjusted 1.13 (1.02–1.25) 0.02 1.14 (0.96–1.34) 0.14 1.09 (0.96–1.23) 0.17
AV adjusted 1.12 (1.02–1.25) 0.02 1.08 (0.92–1.28) 0.35 1.07 (0.95–1.21) 0.26
AVP adjusted 1.12 (1.01–1.25) 0.02 1.08 (0.92–1.28) 0.34 1.08 (0.95–1.21) 0.24
Sensitivity analysis PONV Unadjusted 0.92 (0.88–0.96) < 0.001 0.69 (0.63–0.75) < 0.001 0.86 (0.81–0.91) < 0.001
AV adjusted 0.92 (0.88–0.96) < 0.001 0.68 (0.63–0.74) < 0.001 0.85 (0.81–0.9) < 0.001
AVP adjusted 0.92 (0.88–0.96) < 0.001 0.68 (0.63–0.74) < 0.001 0.86 (0.81–0.9) < 0.001
PV Unadjusted 1.02 (0.92–1.14) 0.72 0.99 (0.82–1.19) 0.88 1.1 (0.97–1.24) 0.13
AV adjusted 1.02 (0.91–1.14) 0.74 0.96 (0.80–1.16) 0.7 1.08 (0.96–1.22) 0.19
AVP adjusted 1.02 (0.92–1.14) 0.7 0.96 (0.80–1.16) 0.69 1.09 (0.96–1.23) 0.17
  1. In a matched cohort of patients, the association of ASA-PS class with PONV and PV was assessed using multivariable Cox proportional hazard regression
  2. PONV postoperative nausea and vomiting, PV postoperative vomiting, HR hazard ratio, CI confidence interval, ASA-PS American Society of Anesthesiologists Physical Status, AV all variables, AVP all variables + propensity score