Across the 12 items, the mean rating for fit was 3.25 and for quality, 3.32. Three items had average fit ratings below a 3 (moderate fit) and were removed from the scale. One of these three items also had a mean quality rating below a 3. The remaining nine items all had average ratings above 3 with average fit ratings of 3.46 and average quality ratings of 3.44, indicating that these items fit the content of the scale and were clear and well written. Raters were also asked to suggest domains of stigma relevant to substance addiction that were not assessed by our scale. None of the raters suggested any additional domains for inclusion in the scale.
