To the Editor: In their Review, Dr van der Lee and colleagues1 found wide variability in the reported prevalence of chronic health conditions in childhood, largely a result of different definitions. Only 1 of the 64 articles included in the Review reported the percentage of children with more than 1 condition.2 Multimorbidity, the co-occurrence of multiple chronic conditions in 1 individual, is increasingly recognized as having a major effect on patient outcomes and health care costs, posing a significant challenge to current models of health care.3
Valderas JM, Starfield B, Salisbury C. Definitions of Chronic Health Conditions in Childhood. JAMA. 2007;298(14):1636–1637. doi:10.1001/jama.298.14.1636-a
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