Table 1 Sample Attrition
From: A real-world analysis of hybrid CDA and ACDF compared to multilevel ACDF
Inclusion/Exclusion Criteria | Hybrid Surgery | mACDF | ||
|---|---|---|---|---|
N | % | N | % | |
Evidence of hybrid surgery or multilevel ACDF between January 1, 2014 and June 30, 2020 (first surgical procedure serves as the index date) | 558 | 100% | 61,625 | 100% |
AND Age 18 or older on index | 558 | 100% | 61,587 | 99.90% |
AND Continuous enrollment for ³6 months prior to index | 444 | 79.60% | 46,775 | 75.90% |
AND No evidence of ACDF or CDA procedures prior to index | 441 | 79.00% | 46,464 | 75.40% |
AND No evidence of other related spinal surgeries in the pre-period (Total Pre-Match Sample) | 430 | 77.10% | 45,818 | 74.30% |
Pre-match Sub-cohorts | ||||
2-level primary | 262 | 60.90% | 43,448 | 94.80% |
3+-level primary | 131 | 30.50% | 1540 | 3.40% |
Secondary | 37 | 8.60% | 830 | 1.80% |
Post-match Samples | ||||
Total Cohort | 430 | 100% | 2,136 | 100% |
2-level primary | 262 | 60.90% | 1,310 | 61.30% |
3+-level primary | 131 | 30.50% | 641 | 30.00% |
Secondary | 37 | 8.60% | 185 | 8.70% |