LCQ Reliability and Reproducibility Flashcards
7 cards from real LCQ practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 LCQ Reliability and Reproducibility flashcards as text
The intraclass correlation coefficient (ICC) is preferred over Pearson's r for assessing LCQ test-retest reliability because ICC:
Answer: Accounts for both consistency and absolute agreement in repeated continuous measurements
Unlike Pearson's r, ICC accounts for both consistency and absolute agreement between repeated measurements, making it more appropriate for continuous reliability data.
An ICC value of 0.85 for the LCQ total score would be interpreted as:
Answer: Excellent reliability
An ICC above 0.75–0.80 is generally classified as good to excellent reliability, indicating strong reproducibility of LCQ scores across repeated administrations.
What does the 95% confidence interval around an ICC value indicate in an LCQ reliability study?
Answer: The precision of the ICC estimate and the uncertainty around it
A 95% CI around the ICC communicates how precisely the reliability estimate has been determined; narrower intervals indicate greater precision.
Which factor is most likely to INFLATE the ICC when measuring LCQ test-retest reliability?
Answer: Including patients across a wide spectrum of cough severity
Including patients with a wide severity range increases between-subject variance, which mathematically inflates ICC values and may overestimate true reliability.
The standard error of measurement (SEM) for the LCQ is important in reliability studies because it:
Answer: Quantifies the error in individual scores attributable to measurement unreliability
The SEM quantifies how much an individual patient's LCQ score may fluctuate due to measurement error alone, independently of any true clinical change.
The relationship between ICC and SEM is best described as:
Answer: Higher ICC values correspond to smaller SEM values
Higher ICC reflects less measurement error, which is directly expressed as a smaller SEM—the two statistics are inversely related in reliability assessment.
Which study design is most appropriate for evaluating LCQ test-retest reliability?
Answer: Prospective cohort study in clinically stable patients with repeat administration
A prospective cohort design in clinically stable patients is optimal because it enables true repeat administration without confounding from clinical change between assessments.