engleski

The reliability and stability of various individual difference and tolerance to shiftwork measures

The aim of the study was to evaluate the reliability and temporal stability of various individual difference and tolerance to shiftwork measures which were used in an extensive study on relationships between shiftworkers' features and tolerance to shiftwork. The study was conducted in an oil refinery where 604 male shiftworkers, working in a 2:2:3 continuous three shift system were examined by means of various questionnaires. A subsample of 61 shiftworkers were reexamined using the same questionnaires and the same addministration procedure after nine years. The questionnaires used comprised: Jenkins Activity Survey, Eysenck Personality Inventory, Morningness Eveningness Questionnaire, Behavioral Arousal Questionnaire, Circadian Type Questionnaire and Inventory, Way of Life Questionnaire, Health Information Questionnaire, Sleep Quality Scale. The questionnaires were scored for fourteen individual difference measures and eight tolerance to shiftwork measures. In addition to these scores sleep durations on night, morning, afternoon shifts and on days off were used as tolerance to shiftwork measures. The reliability of each measure was determined by means of Cronbach alpha coefficients computed on a total of 604 shiftworkers and stability by test-retest correlation coefficients on the subsample of 61 shiftworkers. The internal consistency coefficients for most of the measures ranged between moderate to high, and were considered satisfactory. The test-retest correlation coefficients, taking into account the long period that elapsed between two administrations, proved both the individual difference and tolerance to shiftwork measures to be temporally rather stable. The only measure that had unsignificant test- retest correlation was the sleep duration on days off.

shiftwork ; personality

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