Interobserver agreement in clinical grading of vitreous haze using alternative grading scales.
Ophthalmology
; 121(8): 1643-8, 2014 Aug.
Article
em En
| MEDLINE
| ID: mdl-24697913
ABSTRACT
PURPOSE:
To evaluate the reliability of clinical grading of vitreous haze using a new 9-step ordinal scale versus the existing 6-step ordinal scale.DESIGN:
Evaluation of diagnostic test (interobserver agreement study).PARTICIPANTS:
A total of 119 consecutive patients (204 uveitic eyes) presenting for uveitis subspecialty care on the study day at 1 of 3 large uveitis centers.METHODS:
Five pairs of uveitis specialists clinically graded vitreous haze in the same eyes, one after the other using the same equipment, using the 6- and 9-step scales. MAIN OUTCOMEMEASURES:
Agreement in vitreous haze grade between each pair of specialists was evaluated by the κ statistic (exact agreement and agreement within 1 or 2 grades).RESULTS:
The scales correlated well (Spearman's ρ = 0.84). Exact agreement was modest using both the 6-step and 9-step scales average κ = 0.46 (range, 0.28-0.81) and κ = 0.40 (range, 0.15-0.63), respectively. Within 1-grade agreement was slightly more favorable for the scale with fewer steps, but values were excellent for both scales κ = 0.75 (range, 0.66-0.96) and κ = 0.62 (range, 0.38-0.87), respectively. Within 2-grade agreement for the 9-step scale also was excellent (κ = 0.85; range, 0.79-0.92). Two-fold more cases were potentially clinical trial eligible on the basis of the 9-step than the 6-step scale (P<0.001).CONCLUSIONS:
Both scales are sufficiently reproducible using clinical grading for clinical and research use with the appropriate threshold (≥ 2- and ≥ 3-step differences for the 6- and 9-step scales, respectively). The results suggest that more eyes are likely to meet eligibility criteria for trials using the 9-step scale. The 9-step scale appears to have higher reproducibility with Reading Center grading than clinical grading, suggesting that Reading Center grading may be preferable for clinical trials.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Uveíte
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Corpo Vítreo
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Técnicas de Diagnóstico Oftalmológico
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Oftalmopatias
Tipo de estudo:
Clinical_trials
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Observational_studies
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Prevalence_studies
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Risk_factors_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article