Table 4 Key indicators of content validity for the BTHS-SA, adolescent version
Item | Interpreted as intended (n, %) | Relevance* | Mean response selected, range† | Mean noticeable change rating‡ (SD) | Mean important change rating§ (SD) | |
|---|---|---|---|---|---|---|
Experienced within the past 24 h | Experienced outside of the 24-h recall period | |||||
Item 1: Tiredness at rest | 9/11 (81.8%) | 8/10 (80.0%); | 1/10 (10.0%) | 1.00, 0–2 | 1.00 (0.00) | 1.00 (0.00) |
Item 2: Tiredness during activities | 11/12 (91.7%) | 8/12 (66.7%); | 3/12 (25.0%) | 1.42, 0–2 | 1.25 (0.46) | 1.56 (0.53) |
Item 3: Muscle weakness at rest | 10/11 (90.9%) | 4/12 (33.3%) | 5/12 (41.7%) | 1.17, 0–4 | 1.0 (0.00) | 1.14 (0.38) |
Item 4: Muscle weakness during activities | 8/11 (72.7%) | 8/11 (72.7%) | 3/11 (27.3%) | 1.64, 1–3 | 1.14 (0.38) | 1.50 (0.53) |
Item 5: Muscle pain at rest | 9/11 (81.8%) | 3/11 (27.3%) | 3/11 (27.3%) | 0.82, 0–2 | 1.25 (0.50) | 1.50 (0.58) |
Item 6: Muscle pain due to activities | 10/11 (90.9%) | 7/12 (58.3%) | 2/12 (16.7%) | 1.25, 0–3 | 1.00 (0.00) | 1.43 (0.53) |
Item 7: Feeling of early fullness | 9/12 (75.0%) | 7/11 (63.6%) | 1/11 (9.1%) | 0.82, 0–2 | 1.00 (0.00) | 1.40 (0.55) |
Item 8: Difficulty eating | 11/11 (100.0%) | 1/12 (8.3%) | 5/12 (41.7%) | 0.67, 0–2 | 1.00 (0.00) | 1.00 (0.00) |
Item 9: Headache | 9/12 (75.0%) | 4/12 (33.3%) | 6/12 (50.0%) | 1.00, 0–2 | 1.00 (0.00) | 1.50 (0.76) |