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Missing items are simply a result of items failing to meet the criteria for a Mokken scale as outlined in the Methods section.
Hence, as suggested by Malla et al. [ 3], if the global rating on "affective flattening" or "alogia" was based entirely as a result of items "inappropriate affect" or "poverty of content of speech", respectively, such patients were not included in the PNS group.
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The mechanism also yields entrenchment effects as a result of item-in-construction frequency.
As a result of item analysis, 8 items were eliminated from the pilot instrument (Box 3 [see Additional File 1]).
The mean duration of the sessions was 47 ± 4 min. Table 1 presents the results of items a to f, and Fig. 1 the results of item g.
We also report descriptive results of items and scales between the two AAH catchment areas (inner city vs. suburbs), and test scale mean differences with a t-test as a test of construct validity.
The results of item-level statistics are presented in Table 3.
Additionally, the results of item-total correlation indicated these two items were measuring different psychological constructs.
The results of item-internal consistency are similar to the previous studies.
In accordance with the results of item selection, all response levels of each item were homoegeneously answered.
Table 4 shows the results of item-scale correlation matrix for SF-12 subscales and summary measures.
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