Reliability and validity of non-radiological measures of thoracic kyphosis in chronic obstructive pulmonary disease
Bibliographic record
Abstract
Background/Aims: Thoracic kyphosis in people with chronic obstructive pulmonary disease can be measured from digital photogrammetry or three-dimensional motion capture. This study aimed to determine the reliability, validity and agreement for non-radiological measures of thoracic kyphosis in chronic obstructive pulmonary disease. Methods: A total of 19 participants with chronic obstructive pulmonary disease were included. Cobb angles from chest radiographs and spinous process landmarks using photogrammetry and three-dimensional motion capture were evaluated. Findings: The mean kyphosis (± standard deviation) was 48.8 ± 10.9 degrees by radiograph; 49.6 ± 12.9 degrees by three-dimensional motion capture and 52.2 ± 11.1 degrees by photogrammetry. Radiographic Cobb angle and photogrammetry measurements demonstrated excellent intra- and inter-rater reliability. Correlation between non-radiological kyphosis measurements and chest radiographs was strong (Pearson's r 2 >0.75 for both). Limits of agreement between radiographs and 3D motion capture were –9 degrees to 7 degrees, and –12 to 8 degrees between radiographs and photogrammetry. Conclusions: Non-radiological measures of thoracic kyphosis are reliable and valid in chronic obstructive pulmonary disease.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".