ࡱ> rtqe bjbjŚ .-f-fB&@ @ 8,3$". ^#`#`#`#`#`#`#$%(#i##!!!,^#!^#!!!T&@!J#$03$!c)fnc)!!"c)!LH6!~,P## 3$c)@ K: THE TURKISH RELIABILITY AND VALIDITY STUDY FOR THE PERCEIVED STRESS SCALE Sayg1n M Z MD*, Kaplan O K MD*, nsal C MD*, al1_kan M MD* *Haydarpa_a Numune Research and Training Hospital, Istanbul-Trkiye Stress is a term used to express various meanings. Due to its ill-defined nature, it is difficult to make adequate measurements(Ader,1980). Stress is a process in which environmental demands exceed the adaptive capacity of an organism, resulting in psychological and biological changes that may place persons at risk for disease(Cohen et al,1995). The concept of stress can be used to indicate any factor that is constraining to the individual. These constrains are generally due to external factors. As a result it has been anticipated that stress can be measured through the measurement of environmental events. By so doing, the various scales of life events have been developed. Social Readjustment Rating Scale is a well-known example of the life events scales(Holmes and Rahe,1967). But, various individual differences in the perception and interpretation of events exist. The degree of stress faced by a person cannot accurately be measured by only measuring the events in question. The changes that may occur in an individual due to these events depend on the individuals own interpretation of his/her experiences. For this reason, Cohen et al., developed the Perceived Stress Scale (PSS), in order to measure the degree at which an individual perceives his/her life as stressful(Cohen et al,1983). The aim of this scale is to measure the degree at which a person perceives his/her life as unforeseeable, uncontrollable or extremely over-loaded. The PSS consisted of 14 items during its initial development. It is a scale which an individual can fill all by him/her self in a few minutes and which can easily be understood. Later on, 4 items were removed from it and the PSS-10 Items have been developed. In the various studies performed since than, this short form with 10 items has been used since it includes, similar psychometric characteristics included in the 14 item scale(Cohen et al,1988). Since the degree of stress perception is changeable in accordance with intervening life events, the scores show timely changes for the same individual. Many studies have been performed concerning the psychometric characteristics of PSS and the reliability-validity of its translations into various languages(Chu,2005; Romer,2006). Currently, there is widespread use of the Spanish, Chinese, Bulgarian and other translated versions of PSS. There is no Turkish scale concerning the perception of stress. Our opinion is that the Turkish version of PSS will overcome this absence. The aim of this study is to investigate the reliability and validity of the Turkish translation of PSS. Method Subjects: A total of one hundred people participated in this validation study. These are healthy volunteers, who had no psychiatric complaints and who up till date have not received any psychiatric treatment. The group consists of 54 men (54%) and 46 (46%) women. The average age of our subjects is 40.65 11.68 (min 20-max 63). Characteristics in relation to the level of education, marital status and working condition of the subjects are presented in Table 1. The educational status is classified as primary school to cover the first 8 years of education, from 9 to 12 years as high school and as university for education of over 12 years duration. In our subjects, those who had received education of up to 12 years are in the majority (86%). A greater number of married subjects are represented on the bases of marital status of the participants (74%). On the other hand, the working condition of our subjects consisted of a working population (workers, traders and officers) in the ratio of 73%. The non-working population that consists of housewives and retired individuals is in the ratio of 26%. The Scales Used: Perceived Stress Scale (PSS; Cohen et al., 1983): It is a scale aimed to measure the degree at which a person perceived his/her life as stressful in the last one month. The person fills the scale all by him/her self. Its structure consists of short and simple expressions, in such a way that even an individual with primary school education can understand it. There are three separate forms of 14 items, 10 items and 4 items. In the various studies performed in different languages, the PSS-14 item and the PSS-10 item forms demonstrated similar psychometric characteristics (Cohen and Williamson, 1988; Remor, 2006). As a result, the 10-item form which can be carried out in a shorter period of time has been preferred for the Turkish reliability -validity study. The answers to the items have been evaluated using the 5-score Likert type scale (0=Never, 1=Almost Never, 2=Sometimes, 3=Fairly Often, 4=Very Often). The four items have inversely been scored (6, 7, 8 and 9). The total score of the scale is obtained by calculating the total scores of all the items after reversing these four items. The perceived anxiety level is directly proportional to the score of the scale. The Turkish version of the PSS which has been carried out on the participants is in Appendix-1. State-Trait Anxiety Inventory (STAI; Spielberger et al., 1970): The state-trait anxiety inventory consists of two sections; State anxiety scale (STAI-form 1) which measures how an individual feels at that particular moment in time and Trait anxiety scale (STAI-form 2) which measures how an individual generally feels independent from the conditions. Each section consists of twenty items. It is a scale which the individual can fill up all by him/her self. It is simple and short, can easily be understood and can be completed within ten minutes. The answers to the items are in the form of the 4-Likert scales (For the state anxiety inventory: 1=Never, 2=A Little, 3=Much, 4=Entirely; for the trait anxiety inventory: 1=Almost Never, 2=Sometimes, 3=Often, 4=Almost Always). There are expressions that have been directly and oppositely translated. The directly expressed items are scored according to the numbers by the side; meanwhile those oppositely translated are inversely scored. The state anxiety is found with the total of the score of the first scale, whereas the trait anxiety is found with the total of the score of the second scale. The Turkish reliability and validity study was performed by ner and Le Compte (1985). Application: The PSS-10 items were translated from English to Turkish by a translator. After the translation was reviewed by the psychiatrist (MS) who is responsible to carry out the study, it was later on back-translated into English by another bilingual native English translator who understands and speaks Turkish. The final stage of this reliability -validity study form was carried out on 20 participants and the intrinsic validity was examined. Studies were commenced using these approved form. Informed consent was obtained from all the participants. Each participant was enrolled into the study after being subjected to a psychiatric examination by a senior psychiatric resident. Those who had diagnosable psychopathologies were excluded from the study. Following the psychiatric examination, participants who demonstrated no psychiatric abnormality were asked to fill the PSS and STAI scales. The same individuals were called back for a visit one week later and asked to complete both of the scales. The PSS can be affected by intervening life events and stress factors. The time between two tests has been chosen as one week in order to ensure that there occur no changes in the life conditions of the participants that might affect the scores of the scale and so the re-testing. Statistical Analysis The arithmetic mean, standard deviation and minimum-maximum values are used for the age variable. Numbers and percentages are given for the group defining variables (sex, level of education, marital status and working condition). The arithmetic means, standard deviations, minimum-maximum values and 95 % confidence intervals of the scores obtained from PSS and STAI scales were calculated in the sub-groups that were defined according to sex, age, level of education, marital status and working condition. The internal consistency of both the PSS and the STAI scales for our subjects has been evaluated through calculation of Cronbach  coefficients. The Cronbach  coefficients of the items, the internal correlation coefficients and the 95% confidence intervals of the classes and the Spearman correlation coefficients have been examined for the PSS reliability study. Factor analysis and Eigen values were calculated to verify whether or not it was necessary for the factors to be separated, regarding the construct validity of PSS. Using the Spearman correlation test, the concurrent validity of PSS was evaluated against the STAI scales that assesses the anxiety level. Turkish reliability -validity study of STAI scales has been previously performed (ner and Le Compte,1985). One way analysis of variance has been used to observe the effects of age, level of education and working condition on the scale scores and Tukeys multiple-comparison test has been used to compare the subgroups. The statistical significance of the gender dependent differences between scores of PSS and STAI scales was examined by independent t test, based on scores obtained at the first application of the scales. Results The mean of the total scores of the scales, for the whole group during the first evaluation was found to be 21.908.6 (min 6 - max 39) for PSS; 47.9114.66 (min 22 - max 78) for STAI-1 and 48.4613.27 (min 25 - max 70) for STAI-2. Reliability (Internal consistency and the test-retest reliability): The calculated general Cronbach  coefficient for the internal consistency of PSS in our subjects was 0.856. For STAI-1 this number was 0.955, and for STAI-2 it was 0.950 (Table 2). The Spearman correlation coefficient of each of the PSS items ranges between 0.76 and 0.89. In order to determine the test-retest reliability, the correlation coefficient of the PSS total score for the two evaluations, which were performed one week apart, was 0.92; for the items this coefficient ranges between 0.82 and 0.92 (Table 3). Construct Validity: In the factor analysis performed, only a single dominant factor was found in the scale, for the construct validity of PSS. The Eigenvalues value of this single factor was found to be 5.73 - Variance factor 57.33%. This shows that it is necessary for us to evaluate the scale without classifying the factors (Table 4). Factorial classification was not also suggested in the studies conducted by those who developed the scale. Concurrent Validity: In the Turkish reliability -validity study conducted in order to determine the concurrent validity between the STAI scales used to measure state and trait anxiety, and the PSS, it was found that the two tests were highly concordant. The two tests show a correlation with each other. The correlation coefficient that exists between the PSS and STAI scales ranges between 0.71 and 0.76 (Table 5). The PSS, like the STAI is a test that can measure the anxiety level with reliability. Distribution of the Scale Scores According to Sociodemographic Characteristics: No significant differences occurred in the anxiety levels for the two scales in relation to gender (Table 6). In the validation study conducted by Remor in order to investigate four different groups together, the scores of the women were found to be higher in all the groups under different degrees of stress (Remor, 2006). When this group was divided according to presence and absence of stress, the difference between the genders was found to disappear. No difference between the genders was discovered in our group since it consisted of individuals who were under equal levels of stress. No significant difference was discovered between the anxiety levels and the PSS, with regard to the age groups (Table 7). However, the anxiety levels demonstrated significant differences for the STAI state and trait forms when the grouping was made according to age (p=0.001 and p=0.021 respectively). There was an increase in STAI scores, although no significant difference was observed in the PSS scores as age increased. In respect of age, when the 50 and above group was compared to the groups between 20-30 years, 31-40 years and 41-50 years of age, the STAI scores of the 50 and above group was significantly higher (Table 8). The STAI is a scale that can demonstrate different norms with regards to age, in different societies (Spielberger et al,1970). The anxiety scores of all the scales decrease as the level of education increases. The highest anxiety levels were observed at the primary school level of education. The anxiety scores decreased as the period of education prolonged. The lowest anxiety scores were observed at the higher education levels (Table 9). Statistically significant differences were observed in the anxiety levels of those between the primary school level of education and high school level of education, and also between the primary school level of education and the university levels of education (Table 10). These data suggest that those in the primary school level of education are under more stress (poor financial conditions, socioeconomic problems, problems in relation to work, etc). It is also possible that the highly educated can better cope with their anxiety. No significant difference was observed with the PSS and the STAI, with regards to marital status (Table 11). Marital status did not affect anxiety level in our sample. In respect of working condition, there were significant differences in the anxiety scores in both the PSS and the STAI scales (Table 12). Housewives demonstrated a significantly higher degree of anxiety, when compared to workers and officers with a regular income, in relation to both the PSS and the STAI scales. Retired individuals demonstrated a significantly higher degree of anxiety, compared to officers with a higher income, in relation to the STAI scale (Table 13). This difference was not seen to be significant with the PSS. All retired individuals were in the 50 years and above age group. As has been recalled earlier, there was STAI differentiation among the age group and no difference was observed with PSS in relation to age. As a result retired individuals may appear to demonstrate greater anxiety with the STAI scale, because of their age. Discussion The results have shown to be satisfactorily reliable, with regards to the internal reliability and test-retest reliability of the Turkish version of PSS-10 item. The PSS also demonstrated a high degree of concurrent validity with the STAI scales, which previously showed psychometric characteristics. As age increased there was a decrease in the PSS scores in the norms of the PSS values, obtained from a group of 2387 individuals (Cohen and Williamson, 1988). In our subjects no difference was established with PSS, regarding age. There was however an increase in the STAI scale scores. In our subjects, increase in age together with an increase in the rate of retired individuals and also a decreased income level appeared to be an important factor increasing anxiety. However, PSS did not demonstrate this difference. The levels of anxiety were similar in both scales, with regards to the other demographic properties. As a summary, the Turkish version of PSS is seen as a reliable and valid scale for the measurement of the level of anxiety perception. It is necessary to perform research studies in large groups in order to come out with norms values. References Ader R.(1980). Psychosomatic and psychoimmunological research. Psychosomatic Medicine, 42, 307-321 Cohen S., Kamarck T., Mermelstein R.(1983) A global measure of perceived stress. Journal of health and social behavior, Vol.24, No.4, 385-96 Cohen S., Williamson GM.(1988) Perceived stress in a probability sample of the United States. In S. Spacapan & S. Oskamp (Eds.), The social psychology of health (pp. 31-67). Newbury Park, CA: Sage. Cohen, S., Kessler, R.C., & Gordon, L.U. (1995). Measuring stress:A guide for health and social scientists. New York: Oxford University Press. Herbert TB, Cohen S.(1996) Measurment issues in research on psychosocial stress(pp.295-332). Amsterdam:Academic Press Holmes TH, Rahe RH(1967) The Social Readjustment Rating Scale. Journal of Psychosomatic Research, 11, 213-218 ner N., Le Compte A.(198&(*.8fh   ʻscR hXh}MGOJQJ^JmH sH h<h<5CJOJQJ^Jho[CJOJQJ^Jh<CJOJQJ^Jhug1CJOJQJ^JhOCJOJQJ^Jh}MGCJOJQJ^JhXCJOJQJ^JhXh}MGCJOJQJ^JhXhGCJOJQJ^Jh@CJOJQJ^Jh)lCJOJQJ^JhXhLVCJOJQJ^Jh FWT*"7":'P'$dhxxa$gd( $xxa$gdX$dhxxa$gdX$dhxxa$gdO dhxxgdX J U W o p $ % & ( ) . 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