Table 1.

Demographic and baseline clinical data.

Baseline variable	Discectomy (n=20)	Hydrodiscectomy (n=20)	p-value	Test
Age in years (mean±SD)	41.2±9.3	44.9±9.4	>0.05	Kolmogorov-Smirnov + t-test
Sex (female, %)	50	50	>0.05	chi-squared
Race (white, %)	85	65	>0.05	chi-squared
Education (>8 years, %)	50	50	>0.05	chi-squared
Married (yes, %)	90	65	>0.05	chi-squared
Manual labor (yes, %)	35	40	>0.05	chi-squared
Opioid use (yes, %)	35	45	>0.05	chi-squared
Currently working (no, %)	70	50	>0.05	chi-squared
Receiving government benefits (yes, %)	35	50	>0.05	chi-squared
Months away from work (mean±SD)	4.65±6.52	8.67±14.4	>0.05	Kolmogorov-Smirnov + t-test
Months of experiencing pain (mean ± SD)	16.25±20.2	33.5±47.3	>0.05	Kolmogorov-Smirnov + t-test
VAS score for lumbar pain preoperatively (mean±SD)	7.52±2.7	6.3±3	>0.05	Kolmogorov-Smirnov + t-test
VAS score for leg pain preoperatively (mean±SD)	8.42±2.3	7.36±2.2	>0.05	Kolmogorov-Smirnov + t-test
Preoperatively Oswestry score (mean±SD)	33.65±9.33	26.35±6.6	0.007	Kolmogorov-Smirnov + t-test

SD = standard deviation; VAS = visual analogue scale