Validation of Catquest-9SF in Danish: developing a revised form of the Catquest-9SF – the Danish Catquest-7SF

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Validation of Catquest-9SF in Danish : developing a revised form of the Catquest-9SF – the Danish Catquest-7SF. / Nielsen, Esben; Lundström, Mats; Pesudovs, Konrad; Hjortdal, Jesper.

In: Acta Ophthalmologica, Vol. 97, No. 2, 2019, p. 173-177.

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TY - JOUR

T1 - Validation of Catquest-9SF in Danish

T2 - developing a revised form of the Catquest-9SF – the Danish Catquest-7SF

AU - Nielsen, Esben

AU - Lundström, Mats

AU - Pesudovs, Konrad

AU - Hjortdal, Jesper

PY - 2019

Y1 - 2019

N2 - Purpose: The primary goal was to validate a Danish translated version of the Catquest-9SF by Rasch analysis. The secondary goal was to investigate whether preoperative Catquest-9SF scores, best-corrected visual acuity, comorbidity, gender, age or corneal astigmatism could predict improvements in subjective outcome. Methods: In a prospective trial, 250 patients eligible for cataract surgery were included. Patients filled out the translated Catquest-9SF questionnaire before surgery and again 3 months after surgery. Both preoperative and postoperative questionnaires were included in the Rasch analysis. A multiple reverse stepwise regression model was used to investigate the correlation between preoperative measurements and subjective improvement. Results: The preliminary Rasch analysis showed misfit of items 4 and 6. These items were removed, and the remaining seven items demonstrated a measurement precision of 2.78, a person reliability coefficient of 0.89, ordered response categories, infit of 0.69–1.22, outfit of 0.73–1.14, observed raw variance explained by measures of 70.4% and an eigenvalue of 1.7. Item 7 showed a mild DIF for gender (0.54 logits), and person mean Rasch score targeting was −1.69 logits. Preoperative Catquest score was the only parameter with a significant correlation to a gain in subjective outcome (p < 0.001). A preoperative Catquest-9SF score of 0.5 carried a 95% likelihood of an increase in subjective outcome. Conclusion: The Danish version of the Catquest-9SF fit the Rasch model. Only preoperative Catquest-9SF score was correlated to subjective improvement, and a cut-off value of 0.5 predicted an improvement in subjective outcome with 95% probability.

AB - Purpose: The primary goal was to validate a Danish translated version of the Catquest-9SF by Rasch analysis. The secondary goal was to investigate whether preoperative Catquest-9SF scores, best-corrected visual acuity, comorbidity, gender, age or corneal astigmatism could predict improvements in subjective outcome. Methods: In a prospective trial, 250 patients eligible for cataract surgery were included. Patients filled out the translated Catquest-9SF questionnaire before surgery and again 3 months after surgery. Both preoperative and postoperative questionnaires were included in the Rasch analysis. A multiple reverse stepwise regression model was used to investigate the correlation between preoperative measurements and subjective improvement. Results: The preliminary Rasch analysis showed misfit of items 4 and 6. These items were removed, and the remaining seven items demonstrated a measurement precision of 2.78, a person reliability coefficient of 0.89, ordered response categories, infit of 0.69–1.22, outfit of 0.73–1.14, observed raw variance explained by measures of 70.4% and an eigenvalue of 1.7. Item 7 showed a mild DIF for gender (0.54 logits), and person mean Rasch score targeting was −1.69 logits. Preoperative Catquest score was the only parameter with a significant correlation to a gain in subjective outcome (p < 0.001). A preoperative Catquest-9SF score of 0.5 carried a 95% likelihood of an increase in subjective outcome. Conclusion: The Danish version of the Catquest-9SF fit the Rasch model. Only preoperative Catquest-9SF score was correlated to subjective improvement, and a cut-off value of 0.5 predicted an improvement in subjective outcome with 95% probability.

KW - cataract surgery

KW - Catquest

KW - Rasch analysis

KW - subjective outcome

U2 - 10.1111/aos.13921

DO - 10.1111/aos.13921

M3 - Article

VL - 97

SP - 173

EP - 177

JO - Acta Ophthalmologica

JF - Acta Ophthalmologica

SN - 1755-3768

IS - 2

ER -