title: Unscheduled use of ambulatory care services.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000553:Ambulatory Care; D001071:Appointments and Schedules; D002648:Child; D002675:Child, Preschool; D003258:Consumer Behavior; D003695:Delivery of Health Care; D005191:Family Characteristics; D005260:Female; D006279:Health Maintenance Organizations; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D009922:Oregon; D010044:Outpatient Clinics, Hospital / Q000706:statistics & numerical data*; D012737:Sex Factors; D012959:Socioeconomic Factors