Groups
	Nonsurgical	Surgical
Patient Number (N)	169	49
Mean Age	53.8	48.9	P = .03*
Female/Male Ratio	3.4 (131/38)	3.4 (38/11)
BMI	29.8	30.04	P = .88
Multiple Injections	18 (10%)	9 (18%)	P = .14
Mean ΔPN	3.62	3.88	P = .053