Table 1 . Baseline Characteristics of Patients With Chronic LBP in Both Groups .

Parameter	MIPE n = 35		LLLT n = 35		P Vale a
	Mean	SD	Mean	SD
Age (y)	38.4	10.3	42.1	12.8	.08
Onset since first episode (y)	4.6	3.9	6.1	4.2	.07
BMI	26.4	4.5	25.2	4.1	.42
Sex	60% female –40% male		66% female – 34% male

Abbreviations: LBP, low back pain; MIPE, monochromatic infrared photo energy; LLLT, low level laser therapy; BMI, body mass index.

^a P values are for baseline differences between the 2 groups. Significance level ≤ .05.