Preventive health care consumes a substantial amount of pediatricians' time and has been promoted as one of the most important medical functions physicians perform.1-4 The American Academy of Pediatrics (AAP) has emphasized the need for preventive health care. To assist in the delivery of child health supervision, the AAP Committee on Psychosocial Aspects of Child and Family Health has recently published guidelines recommending specific topics to be covered at each of the routine health maintenance visits.5 Despite the acceptance of recommendations for preventive child health care, the efficacy of office-based prevention strategies has not yet been proven.6 However, assessment of the literature addressing the effectiveness and costs of strategies for promoting and maintaining child health has been noted to be "more remarkable for its limitations than its findings."6