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If a large proportion of the sample is at the floor or ceiling, the ability of the measure to detect any deterioration or improvement in health status is impaired.
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Dr. Fitch and Dr. Hauser concluded that there was a ceiling on the ability of tamarins to recognize patterns in sounds.
This includes whether there is a floor or ceiling effect; the ability of the outcome measure to detect meaningful change over time (responsiveness) [ 8]; and whether there is a known minimal important difference (the smallest change in the outcome measure that patients and clinicians consider to be clinically relevant) [ 9].
Additionally, pre-treatment laboratory evidence of dehydration was only present in five (18%) patients on hypodermoclysis for acute treatment introducing a ceiling effect that limits the ability of the study to observe an improvement in hydration status.
The sensitivity of the SF-12 measurement model was evaluated by examining: i) response distributions for each item in order to ensure that the full range of possible responses is used and ii) summary floor and ceiling effects to assess the ability of the items to capture the full range of health states.
Although the high ceiling effect may limit the ability of EQ-5D-Y to detect moderate impairments of HRQOL, it should be noted that both formats tested here were able to satisfactorily discriminate between groups categorized by their health status on other measures.
The percentages of subjects selecting either the lowest response (floor) or highest response (ceiling) for each question were examined to evaluate floor and ceiling effects, because a large ceiling or floor effect would limit the ability of the questionnaire to detect change over time.
In addition, the percentages of subjects achieving either the highest score (ceiling) or lowest score (floor) were calculated, because a large ceiling or floor effect will limit the ability of SF-36 to detect change over time.
Mr. Geithner said that the summer debate over the debt ceiling had undermined public confidence in the ability of political leaders.
Analysis of floor and ceiling effects provides an indication of the ability of a PRO instrument to detect changes in a study population.
But, he said, airlines lobby hard to prevent airports from raising the passenger fee ceiling partly because restricting this revenue limits the ability of airports to expand.
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