Letters Section Editor: Robert M. Golub, MD, Senior Editor.
In Reply: In response to the comments of Dr Valderas and colleagues, the measurement of multimorbidity indeed poses a methodological challenge. Because the goal of our Review was to find definitions of chronic conditions in childhood, we restricted our search to the literature concerning “children” (aged 0-18 years). Thus, we did not include potentially important articles on this subject from the adult literature. Their comments, coming from a primary care research and development center, emphasize that there is a need for consensus on the definition of chronic health conditions in children and that the associated measurement methods should involve all relevant disciplines including general practice, internal medicine, rehabilitation medicine, and public health.
van der Lee JH, Mokkink LB, Heymans HS, Offringa M. Definitions of Chronic Health Conditions in Childhood—Reply. JAMA. 2007;298(14):1636-1637. doi:10.1001/jama.298.14.1636-b