The PedsQL Generic Core Scales are easy
to score. The items of the four Scales (Physical Functioning, Emotional
Functioning, Social Functioning, and School Functioning) are grouped
together on the actual questionnaire, so it is easy to create Scale Scores.
- On the PedsQL Generic Core Scales,
for ease of interpretability, items are reversed scored and linearly
transformed to a 0-100 scale, so that higher scores indicate better HRQOL
(Health-Related Quality of Life).
- To reverse score, transform the 0-4 scale items to 0-100 as follows:
0=100, 1=75, 2=50, 3=25, 4=0.
- To create Scale Scores, the mean is computed as the sum of the
items over the number of items answered (this accounts for missing data).
If more than 50% of the items in the scale are missing, the Scale Score
should not be computed. Imputing the mean of the completed items in a
scale when 50% or more are completed is generally the most unbiased and
precise method. To do this, count the number of missing values in the
scale (call it nmiss). Next, sum the item scores and divide by the number
of items in the scale minus nmiss. Alternatively, use the Compute command
in SPSS to compute the MEAN.
- To create the Psychosocial Health Summary Score, the mean is
computed as the sum of the items over the number of items answered in the
Emotional, Social, and School Functioning Scales. The Physical Health
Summary Score is the same as the Physical Functioning Scale Score.
- To create the Total Scale Score, the mean is computed as the
sum of all the items over the number of items answered on all the Scales.
|0-100 Scale Scores
Not to be reproduced without permission.
Copyright © 1998- James W. Varni, Ph.D. All rights reserved.