There was no improvement in pain intensity at 4-week , 3-month , or 1-year follow-up ( between-group difference , -0.42 [ 95 % CI , -0.90 to 0.02 ] at 4-week follow-up ; -0.38 [ 95 % CI , -0.84 to 0.09 ] at 3-month follow-up ; and -0.17 [ 95 % CI , -0.62 to 0.27 ] at 1-year follow-up ) .