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Changes in headache severity score (defined by the numerical rating scale (NRS)) post-LP. (a) Change in headache severity score, data as mean ± SEM; (b) percentage change in headache severity, data as mean ± SEM; (c) correlation of change in headache severity between baseline and 1 hour (y axis) with the mean pre-LP and 1 hour post-LP scores (x axis) using Oldham’s method, p = 0.018, rho = −0.294 (Spearman rank correlation).
