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Note. Bars represent mean values of Natural Killer Cell Activity. Error bars represent standard error of measurement. Paired t tests were used to perform within-group analysis for immune variables for each group. TLIF = transforaminal lumbar interbody fusion, n = 17; PLF = posterior lumbar fusion, n = 18; T1 = 1 week before surgery; T2 = day of surgery; T3 = day after surgery; T4 = 6 weeks after surgery; LU = lytic units.
