For SF-36 v.2 calculation, items were transformed into domains.
Second, two panelists believed that the calculation items were too difficult or not pertinent to physical therapy practice and research literature.
To address this concern, the value of calculation items was reduced from 32 to 28 points and one calculation (Negative Predictive Value) was replaced with a question requiring interpretation of an alpha and p-value.
Two specific items were added: one related to misconduct (item 1b), which includes suspicion of forgery, and one related to sample-size calculations (item 4b).
As for savings, Sunstein -- and Obama -- often included in their calculations items like rolling back a rule that theoretically could have treated milk spills like oil spills.
Second, to investigate the psychometric properties - that is whether the instruments were reliable and valid - we used five standard techniques: exploratory factor analysis, reliability coefficient calculations, item-total correlation, inter-scale correlation and scale versus global rating analysis [16], [23], [24].
The items requiring statistical calculations (items 10-12) were among the most difficult for all groups.
This was further explored for OHS and EQ-5D data, available from WHiTE, by calculation of item-to-item Spearman correlation coefficients; that is correlations between all pairs of individual questionnaire items.
The primary outcome measure is the pre-specified outcome considered to be of greatest importance to relevant stakeholders (such a patients, policy makers, clinicians, funders) and is usually the one used in the sample size calculation (see item 7).
