Descriptives of the 1- and 2-Level TDR Subgroups
| 1-Level (n = 54) | 2-Level (n = 32) | Significance | |
|---|---|---|---|
| Gender | P > .70 | ||
| Male | 53.7% | 53.1% | |
| Female | 46.3% | 46.9% | |
| Age (years): | P < .05 | ||
| Mean | 38.0 | 43.9 | |
| Range | 19-57 | 28-59 | |
| Levels Operated | N/A | ||
| L3-4 | 3.7% | N/A | |
| L4-5 | 33.3% | N/A | |
| L5-S1 | 63.0% | N/A | |
| L3-4 & L4-5 | N/A | 12.5% | |
| L4-5 & L5-S1 | N/A | 87.5% | |
| Smoking | P > .60 | ||
| Smoker | 35.2% | 34.4% | |
| Non-smoker | 64.8% | 65.6% | |
| Previous Surgery | P > .60 | ||
| Yes | 33.3% | 37.5% | |
| No | 66.7% | 62.5% | |
| Insurance | P > .60 | ||
| Private Insurance | 79.2% | 74.2% | |
| WC | 20.7% | 25.8% | |
The only significant difference was the mean age in the 2-level cases was significantly greater.