Objectives-To assess the validity of the Protect Scale of the Adult Responses to Children's Symptoms (ARCS) Questionnaire with regard to mothers' responses to their children's abdominal pain.Methods-Mothers with High (n = 32) and Low (n = 35) Protect scores on the ARCS questionnaire were recruited from participants in a larger study of family illness behavior. Mothers completed a 28-day diary report of responses to their children's abdominal pain episodes. Records of their children's annual health service utilization and costs were obtained from their health maintenance organization (HMO).Results-Mothers' scores on the ARCS Protect Scale were significantly correlated with their subsequent diary reports of protective responses to their children's abdominal pain. Compared to children of mothers in the Low Protect group, children of mothers in the High Protect group made significantly more health care visits for gastrointestinal symptoms and had significantly higher health care costs.Conclusions-Results supported the validity of the Protect Scale of the ARCS and demonstrated that mothers' protective responses to children's abdominal pain complaints at home predicted subsequent health service use for gastrointestinal symptoms.Studies of significant others' behavior toward pain patients have documented the impact of social interactions on pain behavior. For example, solicitous behavior by spouses is associated with increased pain complaints and disability in adults with chronic pain. [1][2][3] Similarly, the pediatric literature shows that increased attention from parents is associated with higher levels of pain complaints and disability in children with chronic pain [4][5][6][7] and delayed recovery by children undergoing painful oral surgery. 8 This research is grounded in social learning theory 9 and the findings have been interpreted as evidence that significant others may reinforce patients' pain behavior.Most research in this area uses self-report questionnaires to assess a significant other's typical behavior toward a patient with chronic pain. For example, a subscale of the Multidimensional Pain Inventory asks respondents to rate, on a scale ranging from "never" to "very frequently," how often the patient's spouse engages in solicitous behavior such as taking on the patient's chores. 10 Respondents must estimate the significant other's "usual" response to the patient's pain. However, to the extent that unique circumstances influence behavior on any given occasion, respondents may find it difficult to describe "usual" behavior. Furthermore, research on self-report methodology suggests that recollections of usual behavior may reflect the individual's expectations rather than actual experience 11 or may be biased by the most recent episode, the most extreme episode, or other factors associated with particular episodes of a target behavior. 12 Support for the validity of questionnaire measures of significant others' responses to pain patients would be strengthened by evidence that these measures predict s...