Table 1

Demographic and baseline characteristics.

	Count		Age		L3-L4		L4-L5		L5-S1
	N	%	Mean	SD	N	%	N	%	N	%
Total	76	100	56.47	12.066	21	27.6	40	52.6	15	19.7
Male	38	50	56.53	12.63	11	28.9	20	52.6	7	18.4
Female	38	50	56.42	11.64	10	26.3	20	52.6	8	21.1
			t test p=0.970		chi square p=0.944