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. Author manuscript; available in PMC: 2008 Jul 16.
Published in final edited form as: Behav Med. 1996;21(4):171–183. doi: 10.1080/08964289.1996.9933755

TABLE 1.

Individual Models of Hemicircadian Rhythm Shown in Various Studies

Data sets Ф-12 hr SD r2
Accident5 2.7 2.6 .786
Mortality5 4.5 4.1 .451
Driver drowsiness65 1.7 4.8 .687
Operators' delays in
answering calls1 		3.4 2.0 .421
Locomotive auto-
brakings66 		1.9 2.4 .832
Meter-reading
errors2 		2.3 2.9 .765
Medians 2.5 2.75 .684

Notes. Ф-12 = phase lag in hours past midnight; SD = a sleep deprivation factor used in the equation; Pearson's r2 = amount of variance in the data that was explained by the model. See Figures 7 and 8. Medians = summary of data sets listed above. Superscripts in data set column indicate references listed in the article.