How to measure barriers in accessing mental healthcare? Psychometric evaluation of a screening tool in parents of children with intellectual and developmental disabilities

Table 3 Item Discrimination Index and Item-Total Correlation for the PHBS

Item	Upper Group	Lower Group	Discrimination Index	r_pm
Item 1	.974	.770	.204	.395**
Item 2	.805	.390	.415	.471**
Item 3	.941	.630	.311	.478**
Item 4	.874	.270	.604	.551**
Item 5	.856	.170	.686	.562**
Item 6	.944	.412	.532	.512**
Item 7	.703	.130	.573	.465**
Item 8	.655	.070	.585	.586**
Item 9	.483	.160	.323	.264**
Item 10	.602	.110	.492	.505**
Item 11	.632	.170	.462	.486**
Item 12	.890	.320	.570	.545**
Item 13	.992	.828	.164	.487**
Item 14	.385	.040	.345	.371**
Item 15	.907	.390	.517	.560**
Item 16	.403	.141	.262	.298**

Discrimination Index (I) = P_(U) – P_(L), where P_(U) is the proportion of cases in the upper group and P_(L) is the proportion in the lower group, using the 25th percentile and 75th percentile total score as cutoff scores. r_pm refers to the Pearson product-moment correlation coefficients between the item and the PHBS total score. ** indicates p < .01

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