Table 1.

Summary of Demographic Data.

	Non-rLDH	rLDH	P
Age, mean (95% CI)	48.15 (47.36-48.95)	44.89 (42.74-47.04)	.013
Male/female (%)	693/572 (54.8/45.2)	50/53 (48.55/51.45)	.222
BMI, mean (95% CI)	26.64 (26.35-26.92)	26.58 (25.75-27.42)	.458
Smoker/nonsmoker, n (%)	411/834 (33.12/66.88)	53/50 (51.45/48.55)	.000

Abbreviations: rLDH, recurrent lumbar disc herniation; CI, confidence interval; BMI, body mass index.