Table 2.
Multivariable mixed-effects logistic regression analysis of PNB use among mastectomy cases.
| Characteristic | OR | 95% CI | P value |
|---|---|---|---|
| Per year increase (year of procedure < 2014) | 0.71 | 0.58 – 0.88 | 0.002 |
| Per year increase (year of procedure ≥ 2014) | 2.25 | 2.00 – 2.52 | <0.001 |
| Age at procedure, years | 0.99 | 0.98 – 1.00 | 0.004 |
| Male (vs Female) | 0.31 | 0.16 – 0.60 | <0.001 |
| ASA PS >2 | 0.87 | 0.69 – 1.10 | 0.25 |
| Facility Region | |||
| Region 1 Northeast | — | — | |
| Region 2 Midwest | 10.2 | 3.33 – 31.5 | <0.001 |
| Region 3 South | 2.98 | 0.87 – 10.3 | 0.084 |
| Region 4 West | 7.20 | 2.01 – 25.8 | 0.002 |
| Has tissue expander | 15.4 | 10.3 – 23.1 | <0.001 |
Footnote: Comparisons of post-2014 vs pre-2014 slopes (i.e., interaction term): p<0.001
Multivariable mixed-effects logistic regression clustering on facility ID, with PNB status as outcome in mastectomy cohort. ASA PS = American Society of Anesthesiologists Physical Status; CI = confidence interval; OR = odds ratio; PNB = peripheral nerve block.