For the epidural saline intervention group ( n = 39 ) compared with the sham group , differences in primary outcome were -0.5 ( -6.3 to 5.4 ) at 6 weeks , 1.4 ( -4.5 to 7.2 ) at 12 weeks , and -1.9 ( -8.0 to 4.3 ) at 52 weeks ; for the epidural steroid group ( n = 37 ) , corresponding differences were -2.9 ( -8.7 to 3.0 ) , 4.0 ( -1.9 to 9.9 ) , and 1.9 ( -4.2 to 8.0 ) .
