“…Due to the ease with which they can be administered and because they are generally easy to comprehend, compliance rates for verbal rating scales are comparable to those obtained for other measures of pain intensity (Jensen et al, 1986(Jensen et al, , 1989. In addition, verbal rating scales are positively co-related to other measures of pain intensity and are sensitive tools to assess treatment outcome (Fox & Melzack, 1976;Ohnhaus & Adler, 1975;Rybstein-Blinchik, 1979), and thus can be considered as valid indicants of pain intensity (Ahles et al, 1984;Downie et al, 1978;Jensen et al, 1986Jensen et al, , 1989Kremer et al, 1981;Littman et al, 1985;Ohnhaus & Adler, 1975;Woodforde & Merskey, 1972). The McGill Pain Questionnaire (MPQ) (Chen & Treede, 1985;Dubuisson & Melzack, 1976;Melzack, 1975Melzack, , 1985 is a widely employed verbal pain assessment tool.…”