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. Author manuscript; available in PMC: 2014 Sep 8.
Published in final edited form as: Sleep Biol Rhythms. 2010 Jan;8(1):42–51. doi: 10.1111/j.1479-8425.2009.00422.x

Table 2.

Magnitude of disagreement between different measures of time in bed and total sleep time

Measurement comparisons Average difference (h)
Screening TIB – diary TIB* 0.33 ± 0.49*
Screening TIB – actigraphic TIB* 0.36 ± 0.61*
Diary TIB – actigraphic TIB 0.03 ± 0.31
Screening TST – diary TST* 0.33 ± 0.60*
Screening TST – actigraphic TST* 1.57 ± 0.82*
Diary TST – actigraphic TST* 1.24 ± 0.81*
Screening TST – actigraphic TIB −0.19 ± 0.63
Diary TST – actigraphic TIB* −0.52 ± 0.42*
*

Indicates a significant difference between the two measurements as compared by paired t-tests (P < 0.01).

TIB, time in bed; TST, total sleep time.