Table 1

 Attributes and levels included in the study

AttributeLabelsCodings
Making contact through multiple telephone calls or if integrated with NHS Direct, one call, else in person to nearest ambulatory facility1_CALL INPERSON = 0, not “single call”;  = 1, “single call”  = 0, not “in person”;  = 1, “in person”
Where advisedLOCATION = 15, if NHS 15 miles away  = 5, if NHS 5 miles away  = 0, if at home
Waiting time between initial contact and advice receivedWAIT_TIME = 270 minutes (4.5 hour wait),  = 150 minutes (2.5 hour wait),  = 30 minutes (0.5 hour wait)
Informed of expected waitINFORM_TIME = 1, no information  = 2, some information  = 3, full information
Who advices—could be paramedic, specialist nurse, or doctorsNURSE DOC = 0, not “nurse”;  = 1, “nurse”  = 0, not “doctor”;  = 1, “doctor”
Quality of contact with serviceQUALITY = 1, not enough time to deal with problem, interruptions  = 2, enough time, interruptions  = 3, enough time, no interruptions