Exact(4)
The means of valid items were used if ≥ 50% of the items had valid responses.
The ODI score was calculated as the sum of the ODI items divided by the number of valid items.
For RPs, the number of items marked "yes" was, in several cases, closer to the total number of valid items (those considered "applicable").
In order to build the score, the items were totaled and divided by the total number of valid items answered, multiplied by 13; and e) an adversity indicator, based on the study by Rutter [ 9].
Similar(56)
Using a series of psychometrically valid items, my colleague Jack Zenger and I created a self-assessment that measured a leader's preference for giving or avoiding the two basic kinds of feedback.
For this scale the mean of all valid items was calculated.
Imputation was realised by using the mean of the valid items (on patient level).
We obtained almost identical results for the average quality (secondary outcome) of all valid items (as allocated comparison, 0.11 (–0.01 to 0.22); as reviewed comparison, 0.15 (0.04 to 0.27)).
Six of the SSQ questions (identical to the SMQ) are used to compute a mean score (range = 0 3), computed as the mean of the valid items, if at least half the items were valid.
17 of the SMQ questions are used to compute three subscale mean scores [preschool/school (six items), at home (six items) and in public (five items)] with the same 0 3 scoring range, computed as the mean of the valid items, if at least half the items were valid.
However, to create a questionnaire of acceptable length, valid items might have been excluded.
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