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Overall, we found small to moderate ceiling effects.
Minimal to moderate ceiling effects and no floor effects were found on the Generic Core Scales.
There were moderate ceiling effects on several component question items, perhaps reflecting difficulty in measuring high levels of satisfaction.
Moderate ceiling effects where found for CAP mobility II (37%) which indicates that about 60% of the children have problems with this item, which is of clinical importance.
Nevertheless, given the small to moderate ceiling effects observed for the subscale and composite scores, it appears that this measure can potentially capture improvements in satisfaction.
Similarly, student and parent reports of stability on the Friends subscale, and parent report on the ILC LQ0-100 scouldcould be slightly biased due to moderate ceiling effects.
Similar(52)
For some items, this might reflect a moderate ceiling effect.
For all items, the distribution of answers was left-skewed, with a small floor effect (range 1.7 4.5 %) and a moderate ceiling effect (range 27.6 55.0 %).
In parents of children without sickle cell disease, there was also a moderate ceiling effect in the family functioning summary scale and the worry scale.
Ceiling and floor effects were negligible for all dimensions but the social domain, where a moderate ceiling effect (20.2%) was observed in proxy respondents. 1 Higher mean values indicate better HRQOL (range 0 100).
There was a moderate ceiling effect (score = 10) in 6 items in WORC, highest for item 9 (How much has your shoulder affected your ability to throw hard or far?) with 43.6%.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com