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Table 1 Principal revisions in HALT to the wording of MIDAS

From: The Headache-Attributed Lost Time (HALT) Indices: measures of burden for clinical management and population-based research

Wording in MIDAS [3]

Revised wording adopted for HALT

On how many days … did you miss work or school?

On how many days … could you not go to work or school?

How many days … was your productivity at work or school reduced by half or more?

On how many days … could you do less than half your usual amount in your job or schoolwork?