Percentages of ceiling and floor scores were calculated as an indication of the instrument ability to detect changes over time.
On the other hand, performing optical coherence tomography needs first of all a skilful operator; moreover, thicknesses measurement (expressed in μm) depends from the instrument ability to recognize how all the different retinal structures reflect light.
And composers responded to the latest developments by writing works that took advantage of the new instruments' abilities.
We then examined how well four existing instruments covered these identified topics and found that there were several gaps and insufficiencies in these instruments' abilities to capture the effects of IPF on the quality of patients' lives.
Because operating characteristics of these instruments are similar, selection of a particular instrument should depend on issues such as feasibility, administration and scoring times, and the instruments' ability to serve additional purposes, such as monitoring severity or response to therapy.
Reliability is concerned with reproducibility and internal consistency, while validity concerns an instruments ability to measure what is intended [ 9].
To compare the instruments' ability to distinguish between improved and stable patients, the Receiver Operating Characteristics (ROC) curve was plotted.
These two instruments ability for showing variation was assessed by comparing their ability to differ in severity between the right and left foot in the 13 bilateral clubfeet.
The SDQ has been validated against semi-structured diagnostic interviews in terms of the instruments ability to detect clinically significant behavioural or emotional disturbance.
We also evaluated the instruments' ability to discriminate between patients with different characteristics, i.e. age, gender, duration of disease, treatment modalities and metabolic control reflected in HbA1c.
