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Verteporfin photodynamic therapy for neovascular age-related ...

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DOI: 10.3310/hta16060Health Technology Assessment 2012; Vol. 16: No. 653AEs, like ARs, were reported less frequently than in the TAP trials, in which ‘visual disturbance’was documented in association with 17.7% of VPDT treatment administrations comparedwith 11.6% of sham treatments, and vitreous haemorrh<strong>age</strong> with 1.0% (compared with 0.5% ofsham treatments). 3The variation between centres in the proportion of treatment visits in which an AE was reportedwas greater than expected; 70% (33/47; 95% CI 55% to 83%) had a centre-specific proportionbelow the overall proportion. We attributed this to poor compliance in reporting AEs that wouldhave biased downwards the overall estimate of the probability of an AE. In order to estimatea more representative overall proportion, we excluded data <strong>for</strong> two centres which reported aproportion <strong>for</strong> visit 1 with a centre-specific upper 95% confidence limit below the lower 95%confidence limit <strong>for</strong> the entire cohort. The overall proportion increased to 2.1% (exact 95% CI1.9% to 2.4%). For comparison, the probability of an AE in the centre with the most documentedtreatment visits (1603) was 4.6% (exact 95% CI 3.6% to 5.8%).© Queen’s Printer and Controller of HMSO 2012. This work was produced by Reeves et al. under the terms of a commissioning contract issued by theSecretary of State <strong>for</strong> Health.

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