d Effective environmental temperature = Temperature measured + floor effect (-4°C concrete, -5.5°C steel, +0°C wood, +0.5°C plastic) + effect of bedding (+0 +5°C°C) – airflow × 15.
A ceiling effect makes impossible measuring improvement while a floor effect makes impossible measuring deterioration.
In a previously reported pilot study of Tai Chi in RA a short intervention period and physical functioning measures with floor effects limited conclusions, and further investigations of relevant outcomes in Tai Chi in RA were considered indicated [ 28].
In the abovementioned, both measures displayed a floor effect [ 1].
Some measures are subject to floor effect problems.
Response rates were broadly similar across the measures, with evidence of a floor effect for the NDI and a ceiling effect for the EQ-5D utility measure.
A substantial proportion of the patients used the lowest answering category, which may indicate a floor effect of the measure (inability to discriminate between patients).
None of the three outcome measures demonstrated any floor effects.
Reliable and accurate measures of balance are used to avoid floor effect or ceiling effect.
A high proportion of the person measures were on the left side, suggesting a floor effect.
The tendency for measures to score poorly may be reflective of a floor effect of the COSMIN checklist.
