A validation of the revised circadian type inventory in a working sample

Di Milia, Lee; Smith, Peter A.; Folkard, Simon

doi:10.1016/j.paid.2005.04.012

A validation of the revised circadian type inventory in a working sample

The measurement properties and construct validity of the two-factor 11-item Circadian Type Inventory (CTI) was examined in a working sample comprising shiftworkers and day workers. The two factors explained 50.04% of the variance (LV = 20.24% and FR = 29.80%). Inter-item correlations were all sig…