Table IIb:
Baseline Study Population Characteristics in Model Development and Validation
| Breast Cancer Patients Cohorts | Development | Validation | |||
|---|---|---|---|---|---|
| n | % | n | % | ||
| Admitting Primary Surgeon | General Surgeon | 147780 | 90.3 | 25600 | 89.6 |
| Plastic Surgeon | 15833 | 9.7 | 2984 | 10.4 | |
| Admission Quarter | January 1 - March 31 | 41442 | 25.3 | 7499 | 26.2 |
| April 1 - June 30 | 39059 | 23.9 | 6901 | 24.1 | |
| July 1 - September 30 | 41824 | 25.6 | 6639 | 23.2 | |
| October 1 - December 31 | 41288 | 25.2 | 7545 | 26.4 | |
| Surgery Type | Partial Mastectomy | 67922 | 41.5 | 13677 | 47.8 |
| Oncoplastic Surgery | 10162 | 6.2 | 1399 | 4.9 | |
| Mastectomy Alone | 45690 | 20.7 | 7111 | 24.9 | |
| Mastectomy with Implant | 33865 | 20.7 | 5602 | 19.6 | |
| Mastectomy with Muscular Flap | 5974 | 3.7 | 795 | 2.0 | |
| Axillary Lymph Node Management | None SLNBx |
61343 76128 |
37.5 46.5 |
11253 14288 |
39.3 50.0 |
| ALNDx | 26142 | 16.0 | 3063 | 10.7 | |
| Anesthesia Type | General | 153020 | 93.5 | 26750 | 93.6 |
| Monitored Anesthesia Care | 9569 | 5.8 | 1722 | 6.0 | |
| Other: Spinal, Local or Regional block | 1024 | 0.6 | 112 | 0.4 | |
| Foreign Body Placement | Yes | 954 | 0.6 | 110 | 0.4 |
| Any Complication | Yes | 8797 | 5.4 | 1217 | 4.3 |
| Infectious Complication | Yes | 6239 | 3.8 | 927 | 3.2 |
| Hematologic Complication | Yes | 2107 | 1.3 | 256 | 0.9 |
| Internal Organ Complication | Yes | 639 | 0.4 | 81 | 0.3 |