... manipulation had a clinically important advantage over light massage in headache pain, number, and disability; there was littleeffect of dose. A path analysis suggested that a trial onmanipulation ... forbinary data [5,7].Clearly, binary analysis is appropriate with naturallydichotomous variables, such as cure or death. When out-comes are evaluated as continuous variables, such asscales ... Korff painscale of Underwood et al [27]. The primary outcome was the pain scale and is the average of three 11-point numer-ical rating scales: CGH pain today, worst CGH pain in the last four...