Table 2.
Primary and secondary outcomes. Data are expressed as n (%), or median (inter-quartile range [25th–75th percentile], values separated by comma). Results are reported as odds ratios (ORs), or incidence rate ratios (IRRs). ∗Analysis performed only in cases with available PACU admission and discharge times (n=85 970). CI, confidence interval; IQR, inter-quartile range.
| Outcomes | Group 1 (n=24 392) |
Group 2 (n=23 574) |
Group 3 (n=28 125) |
Group 4 (n=26 541) |
|---|---|---|---|---|
| Primary outcome | ||||
| Postoperative respiratory complications | 1448 (5.94) | 1607 (6.82) | 2079 (7.39) | 1525 (5.75) |
| Unadjusted OR (95% CI) | Reference | 1.16 (1.08, 1.25) P<0.001 |
1.26 (1.18, 1.36) P<0.001 |
0.97 (0.90, 1.04) P=0.360 |
| Adjusted OR (95% CI) | Reference | 1.07 (0.99, 1.16) P=0.085 |
1.09 (1.01, 1.18) P=0.028 |
1.26 (1.14, 1.38) P<0.001 |
| Secondary outcomes | ||||
| PACU length of stay (min) ∗, median (IQR) | 179 (136, 251) | 183 (139, 256) | 183 (137, 256) | 154 (117, 210) |
| Unadjusted IRR (95% CI) | Reference | 1.01 (1.00, 1.02) P=0.039 |
1.02 (1.01, 1.03) P<0.001 |
0.84 (0.83, 0.84) P<0.001 |
| Adjusted IRR (95% CI) | Reference | 1.01 (1.00, 1.02) P=0.017 |
1.04 (1.03, 1.05) P<0.001 |
1.04 (1.02, 1.05) P<0.001 |
| ICU admission within 7 days | 758 (3.11%) | 855 (3.63) | 1321 (4.70) | 816 (3.07) |
| Unadjusted OR (95% CI) | Reference | 1.17 (1.06, 1.30) P=0.002 |
1.54 (1.40, 1.68) P<0.001 |
0.99 (0.89, 1.09) P=0.829 |
| Adjusted OR (95% CI) | Reference | 1.11 (0.98, 1.25) P=0.089 |
1.47 (1.31, 1.65) P<0.001 |
1.75 (1.51, 2.02) P<0.001 |