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Table 8 Correlations of HIT-6 total score change scores (baseline to week 12) with reference measures

From: Reliability and validity of the 6-item Headache Impact Test in chronic migraine from the PROMISE-2 study

Reference measure Expectation Correlation Expectation met?
MMDs (past 4 weeks) 0.30 to 0.50 0.48 Direction and Magnitude
Patient global impression of change 0.10 to 0.30 0.57 Direction
SF-36 bodily pain ‒0.50 to ‒0.10 ‒0.47 Direction and Magnitude
SF-36 physical role functioning ‒0.50 to ‒0.30 ‒0.49 Direction and Magnitude
SF-36 emotional role functioning ‒0.30 to 0.00 ‒0.35 Direction
EQ-5D-5L usual activities* 0.10 to 0.30 0.20 Direction and Magnitude
EQ-5D-5L mobility* 0.00 to 0.10 0.12 Direction
  1. EQ-5D-5L EuroQol five-dimension, five-level scale, HIT-6 6-item Headache Impact Test, MMDs monthly migraine days, SF-36 Short-Form Health Survey (v2.0)
  2. *Denotes categorical item and Spearman correlations