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Since CINS items (knowledge of evolution) are dichotomously scored, person ability and item difficulty were estimated with Rasch's simple logistic model.
The variable "PMS items knowledge score" was not significantly correlated with participation.
Regarding the preference for TBAs, two items knowledge and distance to hospital were excluded.
The cronbach alpha coefficient of the variable for "PMS items knowledge score" is 0.848.
Knowledge sub-scores are also reported for CRC risk factor and screening items (knowledge of CRC, n = 10) and for dietary and genetic risk factor items (knowledge of GERA, n = 10).
The "PMS items knowledge score" is the total score concerning the knowledge the respondents had as to what PMS items are tested in the screening.
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Additionally the instrument comprised of a 12-item knowledge scale.
For the 13-item knowledge score, all thirteen questions were weighted equally with one point.
However, this was improved compared to the original 6-item "knowledge" subscale (Cronbach's alpha = 0.56).
The mean of the correct answers for the 33 item knowledge test was 19.8 points (min = 5, max = 26, SD = 3.704).
Objective understanding of IBIS-II was assessed using 12- and 16-item knowledge scales for the Prevention and DCIS cohorts respectively, developed specifically for this study.
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