Folkard, Monk and Lobban (1979) proposed a questionnaire which offered promise to help distinguish between personnel who differ in the degree to which their circadian rhythms adjust to shift work schedules. Fourteen male and ten female subjects completed two versions of the questionnaire. A period of irregular shift work was interposed between the two administrations. Significant differences were found in the way the questions were answered on the two administrations. Factor analysis products were not consistent for the two administrations nor with the original scale.
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References
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FolkardS.MonkT. H.LobbanM. C.Towards a predicative test of adjustment to shift work. Ergonomics, 1979, 22, 79–91.
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