Table 1.

Reherniation surgery rates by time period for combined Randomized and Observational cohort^*

Time period	Total, N = 810† (no. [%])
1-year	28 (4%)
2-year	40 (5%)
3-year	44 (6%)
4-year	50 (6%)
5-year	54 (7%)
6-year	60 (8%)
7-year	67 (8%)
8-year	74 (9%)

^*One-, 2-, 3-, 4-, 5-, 6-, 7-, and 8-year reherniation surgery rates are Kaplan-Meier estimates. Numbers and percentages are based on the first reherniation surgery if more than one reherniation surgery. Surgical procedures include any additional spine surgery, not just reoperation at the same level.

^†A total of 820 patients had surgery. Surgical information was available for 810 patients.