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If 10% or fewer of the items are missing (i.e., 1 2 missing items for the APS20) then the mean score of the non-missing items may be used to estimate the APS20.
Table 3 shows the number of missing items for each of the questionnaires.
Missing items for the SF-36 MCS were dealt with as per the instrument's instructions.
The percentage of missing items for each scale will be calculated for each participant.
Respondents who only partially completed the questionnaires were sent a photocopy of the missing items for them to complete.
Within these ratings there was 3.7% missing items for the ADRQL and 4.1% missing values for the QUALIDEM.
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The number of missed items for the PORPUS was low and virtually identical under both conditions of data collection.
Intervention group: conventional review plus an additional review looking for missing items from reporting guidelines.
Genuinely missing items were excluded for factor and reliability analysis, leaving 79 complete datasets for analysis.
Paper-based questionnaires are often disliked by patients, data are sometimes unreadable, and missing items are challenging for statistical data analysis [12].
Missing items were accounted for based on the developer's recommendation.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com