Table 3.
Known-groups validity: LCQ score at baseline by CSD total score groups at baseline. a
| LCQ domain | CSD tertile Group 1 |
CSD tertile Group 2 |
CSD tertile Group 3 |
Overall F value | p value | |||
|---|---|---|---|---|---|---|---|---|
| N | Mean (SE) | N | Mean (SE) | N | Mean (SE) | |||
| Total score | 76 | 13.5 (0.30) | 85 | 11.7 (0.29) | 78 | 9.9 (0.30) | 35.68 | <0.0001 |
| Physical | 76 | 5.0 (0.10) | 85 | 4.6 (0.10) | 78 | 3.7 (0.10) | 40.20 | <0.0001 |
| Psychological | 76 | 4.3 (0.13) | 85 | 3.6 (0.12) | 78 | 3.2 (0.13) | 16.41 | <0.0001 |
| Social | 76 | 4.3 (0.13) | 85 | 3.5 (0.12) | 78 | 3.0 (0.12) | 29.82 | <0.0001 |
CSD, Cough Severity Diary; LCQ, Leicester Cough Questionnaire; SE, standard error.
a
Participants were stratified into tertiles using sample distribution according to CSD score at baseline. Group 1 represents participants with the lowest CSD scores (i.e., lowest cough severity), whereas group 3 represents those with the highest CSD scores (i.e., highest cough severity).