Digit Preference in Goldmann Applanation Tonometry: The Hedgehog Effect - 18/08/11
, K. Chatzinikolas, MD, N. Giannopoulos, MD, J. Nair, MRCOphth, S.H. Kelleher, MRCOphth, S.D. Raj : FRCS(Ed), K. Roy, MRCOphth, G. Naylor : FRCOphth
Inquires to Alex Buller, Manchester Royal Eye Hospital, Oxford Road, Manchester, M13 9WH, UKRésumé |
Purpose |
Digit preference is a subconscious bias towards numbers that end in certain digits. We conducted a study to assess for digit preference in intraocular pressure measurement using the Goldmann applanation tonometer.
Design |
Prospective study with masked and unmasked phases.
Methods |
The study was conducted in general ophthalmic clinics in a District General Hospital in Blackpool, United Kingdom, by 6 clinical ophthalmologists. Consecutive right eye intraocular pressure measurements were collected for a 2-month period for the masked phase and were repeated for the unmasked phase. The proportion of even numbers was the main outcome measure.
Results |
Six ophthalmologists completed both phases: 555 of 917 readings were even in the masked phase (P = .075), and 679 of 1056 readings were even in the unmasked phase (P = .022).
Conclusions |
Our results suggest that digit preference influences measurements from the Goldmann applanation tonometer and that this persists when observers are aware of digit preference. This bias may influence both clinical decision-making and trial results.
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Vol 140 - N° 3
P. 527-529 - septembre 2005 Retour au numéro
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