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Table 7 Classical Test Theory –Summary for PRI Health and Addiction Risk Scales in Surveys 1 and 2

From: Development and validation of a new instrument to measure perceived risks associated with the use of tobacco and nicotine-containing products

Proposed Scale
(# items)
Range
don’t know responses
(%)
Min-Max
Sum score
Mean Sum score
(SD)
Range
CITC
Ceiling/ Floor (%) Skewness Cronbach’s alpha Mean IIC Range IIC
Survey 1
 Health Risk (18) 11–15 18–90 54.4 (22.32) 0.89–0.93 7/10 0.05 0.99 0.83 0.76–0.90
 Addiction Risk (7) 8–12 6–30 20.7 (7.50) 0.90–0.93 8/20 −0.41 0.98 0.87 0.82–0.91
Survey 2
 Health Risk (18) 12–14 18–90 56.1 (20.46) 0.88–0.92 5/10 0.02 0.99 0.81 0.75–0.89
 Addiction Risk (7) 8–13 6–30 20.6 (7.09) 0.92–0.95 6/18 −0.32 0.98 0.89 0.85–0.93
  1. SD standard deviation, CITC corrected item-total correlation, IIC inter-item correlation