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. Author manuscript; available in PMC: 2021 Mar 1.
Published in final edited form as: Spine J. 2019 Oct 22;20(3):344–351. doi: 10.1016/j.spinee.2019.10.005

Table 2:

The proportions of patients undergoing staged RFA and repeat RFA within three years.

Overall Zero One Two+ Mean (SD)
Staged Observeda 34,947 23,524 10,776 647 0.4 (0.5)
RFA (67.3%) (30.8%) (1.9%)
Adjustedb 44,936 68.5% 29.9% 1.6% 0.3 (1.3)
Repeat Observedc 9,278 5,978 1,287 2,013 1.0 (2.0)
RFA (64.4%) (13.9%) (21.7%)
Adjustedd 34,947 74.5% 12.2% 13.2% 0.5 (1.6)
a

Includes all patients who had at least 180 days of continuous follow-up.

b

Inverse probability weighted estimate, including patients followed for less than 180 days, adjusting for age, sex, health plan, region, Charlson Comorbidity Index, three or more levels treated during index RFA, and year of index RFA.

c

Includes all patients who had at least three years of continuous follow-up.

d

Inverse probability weighted estimate, including patients followed for less than three years, adjusting for age, sex, health plan, region, Charlson Comorbidity Index, three or more levels treated during index RFA, and year of index RFA.

Abbreviations: RFA – radiofrequency ablation.