The basic format of this scale includes 26 questions made by Taylor, Ryan and Bagby in 1985 (
27), and reviewed and reduced into a 20-question format by Bagby, Taylor and Parker in 1994 (
28). Bagby and colleagues (1994) found that TAS-20, the validity test, possesses three structural factors, thus is consistent with the construct of alexithymia. Many studies have also supported these results. In general, the scale has 20 items and measures three subscales on five-pointed spectrum of Likert (1 for "I completely disagree" to 5 for "I strongly agree "); the three subscales include, difficulty in identifying feelings, difficulty in describing feelings, and objective thinking (outward-oriented). Minimum score is thus 20 and maximum is 100. Total score for alexithymia is calculated by adding the subscales. Questions 4, 10, 18 and 19 are valued in a reverse basis (
28). Bagby, Taylor and Parker (1993; Quoted by Muller, Buhner and Ellgring, 2003) considered total scores of 51 and below as non-alexithymic and scores of 61 and above as alexithymic; adding that the greater score means higher and severer cases of alexithymia (
29). Bagby and Taylor (1997; Quoted by Karukivi, 2011) also declared 61 as the set cut of point of the scale, so that alexithymics achieve 61 or more (
30). Accordingly, this study follows the order just described. Psychometric properties of Toronto Alexithymia Scale-20 have been reviewed and confirmed by numerous studies (
25). Ghaseminejad (2011) in a study titled “comparison of anxious sensitivity, negative affect and alexithymia between asthmatic patients and normal people through mental health monitoring in Ahvaz” used this scale and reported its reliability with Cronbach's Alpha; the reliability scores were as follows, for the total score scale, 0.71, difficulty in describing feelings 0.60, difficulties in emotion recognition 0.72 and objective thinking, 0.51 (
31). Besharat (2007) investigated concurrent validity of this scale in terms of correlations between the subscales and the scales of the tests, such as emotional intelligence, psychological well-being and psychological distress; the results of their study confirmed the validity of the test. The results showed that there is a significant relationship between the scores on the scale of alexithymia with EI (P < 0.001, r = - 0.80), psychological well-being (P < 0.001, r = - 0.78) and psychological distress (P < 0.001, r = 0.44). The correlation coefficient between these variables and alexithymia subscales were also significant. Using the results of the affirmative factor analysis, Besharat (2007) also confirmed three factors (difficulty in describing feelings, difficulty in identifying feelings and objective thinking) in the Farsi version of the Toronto -Alexithymia Scale 20 (
32).