Table 1.
Baseline characteristics by device type
| Static device (N = 30) | Expandable device (N = 30) | p value* | |
|---|---|---|---|
| Age (mean ± SD, years) | 53.5 ± 11.7 | 52.2 ± 12.1 | 0.683 |
| Sex (n) | 0.260 | ||
| Female | 36.7% (11) | 23.3% (7) | |
| Male | 63.3% (19) | 76.7% (23) | |
| Body mass index | 0.606 | ||
| Non-obese (< 30 kg/m2) | 46.7% (14) | 53.3% (16) | |
| Obese (≥ 30 kg/m2) | 53.3% (16) | 46.7% (14) | |
| Smoking status (n) | 0.718 | ||
| Non-smoker | 86.7% (26) | 83.3% (25) | |
| Smoker | 10.0% (4) | 16.7% (5) | |
| Insurance status (n) | |||
| Non-WC | 70.0% (21) | 73.3% (22) | 0.774 |
| WC | 30.0% (9) | 26.7% (8) | |
| CCI (mean ± SD) | 2.0 ± 1.6 | 2.2 ± 1.8 | 0.597 |
| Operative level (n) | 0.333 | ||
| L3L4 | 0.0% (0) | 3.3% (2) | |
| L4L5 | 63.3% (19) | 63.3% (19) | |
| L5S1 | 36.7% (11) | 30.0% (9) | |
| Operative time (mean ± SD, minutes) | 112.4 ± 31.1 | 114.7 ± 28.0 | 0.764 |
| Estimated blood loss (mean ± SD, mL) | 53.2 ± 29.6 | 48.5 ± 28.3 | 0.535 |
| Length of stay (mean ± SD, hours) | 38.2 ± 17.1 | 32.1 ± 15.7 | 0.156 |
SD, standard deviation; WC, worker’s compensation; CCI, Charlson Comorbidity Index
*p values calculated using χ2 analysis (categorical) and Student’s t test and p < 0.001 (continuous)