In Reply We thank Amrapala et al for raising issues related to the complexities of defining childhood social position in response to our recent article.1
Longitudinal studies in the United Kingdom are well recognized as one of the most crucial sources of evidence for health policy worldwide.2 Our study highlighted the change in associations between childhood social position and impaired visual function over 25 years, using 3 key existing British cohorts on which objective measures on visual function have been recorded. To investigate trends over time, it was necessary to identify relevant, comparable factors at equivalent points in the individual cohorts. Over the period, both societal change and updates to research methods had occurred, and in addition, priorities had shifted that influence the extent to which the sociodemographic data collected are equivalent or comparable.
Bountziouka V, Cumberland PM, Rahi JS. Trends in Visual Health Inequalities in Childhood Through Associations of Visual Function With Sex and Social Position Across 3 UK Birth Cohorts—Reply. JAMA Ophthalmol. 2018;136(2):223. doi:10.1001/jamaophthalmol.2017.6197
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