Data collection instruments, included a personal demographic and social form, the QWL questionnaire, and burnout inventory. The personal demographic and social form included variables of age, gender, level of education, marital status, number of children, work experience, shift work, number of shifts per month, and type of ward. The questionnaire on the QWL was based on the model developed in 1973 by Richard Walton and had 24 questions on a 5-point Likert scale, which measured eight components of QWL, including fair and adequate income, safe and healthy workplace environment, providing opportunities for growth and job security, adherence to rules and regulations of the organization, social dependence on work life, overall atmosphere of life, social integration, and development of human capacities. Levels of QWL in this scale were identified at low, medium, and high levels (WR 1973). Shakernia et al. (2010) used facial validity to determine the validity of the questionnaire and applied test-re-test to measure the reliability. The correlation coefficient was obtained as 0.9, which showed a desirable correlation of the questions. A preliminary study was conducted to determine the reliability of the QWL questionnaire, by which a Cronbach’s alpha of 0.95 was calculated (
20). The third instrument was the Maslach burnout inventory, which was used to evaluate burnout. This inventory had 22 questions. Nine questions assessed emotional exhaustion, 5 questions measured depersonalization, and 8 questions evaluated personal accomplishment (
21). Khaghanizade et al. (2008) calculated the burnout internal reliability for each of the subtests and reported the internal reliability of the questionnaire with a Cronbach’s alpha of 0.71 to 0.90 and a test-re-test coefficient of 0.60 to 0.80. In addition, this questionnaire has been frequently used by Iranian researchers and according to the available reports, it has been confirmed with a scientific reliability of more than 0.90. Validity was determined by content and face methods (
22). Two scales can be used for this questionnaire, including the frequency scale (number of times in a month) and the intensity scale (intensity each time). The frequency of these feelings ranged from 0 to 6 (never, few times a year, once a month, a few times a month, once a week, several times a week, and every day, respectively) and the emotional intensity ranged from 0 to 7 (never, very low, low, sometimes, often, high and very high, respectively).The sub-score obtained in each of these 3 dimensions (emotional exhaustion, depersonalization and personal accomplishment, respectively) is placed in 3 categories of low, medium or high based on the criterion score. A high mean score for emotional exhaustion and depersonalization and a low mean score for personal accomplishment would indicate a high degree of burnout. In regards to severe, moderate, and mild categories for burnout, Maslach and Jackson performed this test on large groups of occupations, based on which, the following classification was obtained for the subscales of the test.
Emotional exhaustion: High: A score above 30 for frequency and above 40 for intensity. Medium: A score between 18 and 29 for frequency and between 26 and 39 for intensity. Low: A score below 17 for frequency and below 25 for intensity.
Depersonalization: High: A score above 12 for frequency and above 15 for intensity. Medium: A score between 6 and 11 for frequency and a score above 15 for intensity. Low: A score below 5 for frequency and below 6 for intensity.
Personal accomplishment: High: A score below 33 for frequency and below 36 for intensity. Medium: A score between 34 and 39 for frequency and between 37 and 43 for intensity. Low: A score above 40 for frequency and above 44 for intensity (
21).
The minimum score of the questionnaire is zero and maximum score is 126.