LCQ LCQ Research and Comparative Studies 2 — Questions and Answers
Question 1: Research comparing LCQ scores between males and females with chronic cough has generally found:
- Males consistently score lower (worse) than females
- Females generally report lower (worse) LCQ scores, particularly on the psychological domain (Correct answer)
- No sex-based differences in LCQ scores
- Males score worse on social domain only
Correct answer: Females generally report lower (worse) LCQ scores, particularly on the psychological domain
Studies indicate that females with chronic cough tend to report greater quality of life impairment on the LCQ, especially on the psychological domain.
Question 2: The LCQ has been used to demonstrate that chronic cough in interstitial lung disease (ILD) produces:
- Mild and clinically insignificant quality of life impairment
- Substantial quality of life impairment comparable to or exceeding that in COPD (Correct answer)
- Better quality of life than healthy controls
- Impairment limited to the physical domain only
Correct answer: Substantial quality of life impairment comparable to or exceeding that in COPD
Research using the LCQ in ILD patients has shown substantial multi-domain quality of life impairment, often comparable to the burden seen in COPD.
Question 3: In a landmark randomized controlled trial using the LCQ, gefapixant (a P2X3 antagonist) demonstrated:
- No significant improvement in LCQ scores versus placebo
- A statistically significant and clinically meaningful improvement in LCQ total scores compared to placebo (Correct answer)
- Worsening of LCQ psychological domain scores
- Improvement in FEV1 but not LCQ scores
Correct answer: A statistically significant and clinically meaningful improvement in LCQ total scores compared to placebo
Phase III trials of gefapixant showed statistically significant, clinically meaningful LCQ total score improvements versus placebo in patients with refractory chronic cough.
Question 4: When the LCQ is used in longitudinal cohort studies, what is the typical pattern of LCQ scores in untreated chronic cough patients?
- Spontaneous improvement over 12 months
- Stable or progressively worsening scores over time without treatment (Correct answer)
- Fluctuating scores with no trend
- Rapid improvement in the first 3 months
Correct answer: Stable or progressively worsening scores over time without treatment
In untreated chronic cough cohorts, LCQ scores tend to remain stable or worsen over time, reflecting the chronic, persistent nature of the condition.
Question 5: A meta-analysis of cough PROs would rank the LCQ's internal consistency (Cronbach's alpha) as:
- Poor (alpha < 0.60)
- Acceptable (alpha 0.60–0.69)
- Good to excellent (alpha > 0.70) (Correct answer)
- Variable and unreliable across studies
Correct answer: Good to excellent (alpha > 0.70)
The LCQ consistently demonstrates good to excellent internal consistency with Cronbach's alpha values typically above 0.70 across multiple studies.
Question 6: Research using the LCQ in post-COVID-19 patients with persistent cough has demonstrated:
- No measurable quality of life impairment
- Significant multi-domain LCQ impairment similar to idiopathic chronic cough (Correct answer)
- Only physical domain impairment
- LCQ scores superior to healthy controls
Correct answer: Significant multi-domain LCQ impairment similar to idiopathic chronic cough
Studies applying the LCQ in post-COVID-19 patients with persistent cough show significant impairment across all three domains, mirroring patterns seen in idiopathic chronic cough.
LCQ LCQ Research and Comparative Studies 2
Research comparing LCQ scores between males and females with chronic cough has generally found: