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Compute MCTQ total time in bed

Source: R/tbt.R
tbt.Rd

[Maturing]

tbt() computes the total time in bed for standard and shift versions of the Munich ChronoType Questionnaire (MCTQ).

Usage

tbt(bt, gu)

Arguments

bt

An hms object corresponding to the local time of going to bed from a standard or shift version of the MCTQ questionnaire.

gu

An hms object corresponding to the local time of getting out of bed from a standard or shift version of the MCTQ questionnaire. You can use gu() to compute it.

Value

A Duration object corresponding to the vectorized difference between gu and bt in a circular time frame of 24 hours.

Details

Standard MCTQ functions were created following the guidelines in Roenneberg, Wirz-Justice, & Merrow (2003), Roenneberg, Allebrandt, Merrow, & Vetter (2012), and from The Worldwide Experimental Platform (theWeP, n.d.).

\(\mu\)MCTQ functions were created following the guidelines in Ghotbi et al. (2020), in addition to the guidelines used for the standard MCTQ.

MCTQ\(^{Shift}\) functions were created following the guidelines in Juda, Vetter, & Roenneberg (2013), in addition to the guidelines used for the standard MCTQ.

See the References section to learn more.

Class requirements

The mctq package works with a set of object classes specially created to hold time values. These classes can be found in the lubridate and hms packages. Please refer to those package documentations to learn more about them.

Rounding and fractional time

Some operations may produce an output with fractional time (e.g., "19538.3828571429s (~5.43 hours)", 01:15:44.505). If you want, you can round it with mctq:::round_time().

Our recommendation is to avoid rounding, but, if you do, make sure that you only round your values after all computations are done. That way you avoid round-off errors.

Guidelines

Roenneberg, Allebrandt, Merrow, & Vetter (2012), Juda, Vetter, & Roenneberg (2013), and The Worldwide Experimental Platform (n.d.) guidelines for tbt() (\(TBT\)) computation are as follows.

Notes

  • This computation must be applied to each section of the questionnaire.

  • If you are visualizing this documentation in plain text, you may have some trouble understanding the equations. You can see this documentation on the package website.

For standard and micro versions of the MCTQ

$$TBT_{W/F} = GU_{W/F} - BT_{W/F}$$

Where:

  • \(TBT_{W/F}\) = Total time in bed on work or work-free days.

  • \(GU_{W/F}\) = Local time of getting out of bed on work or work-free days.

  • \(BT_{W/F}\) = Local time of going to bed on work or work-free days ("I go to bed at ___ o'clock").

* \(W\) = Workdays; \(F\) = Work-free days.

For the shift version of the MCTQ

$$TBT_{W/F}^{M/E/N} = GU_{W/F}^{M/E/N} - BT_{W/F}^{M/E/N}$$

Where:

  • \(TBT_{W/F}^{M/E/N}\) = Total time in bed between two days in a particular shift or between two free days after a particular shift.

  • \(GU_{W/F}^{M/E/N}\) = Local time of getting out of bed between two days in a particular shift or between two free days after a particular shift.

  • \(BT_{W/F}^{M/E/N}\) = Local time of going to bed between two days in a particular shift or between two free days after a particular shift ("I go to bed at ___ o'clock").

* \(W\) = Workdays; \(F\) = Work-free days, \(M\) = Morning shift; \(E\) = Evening shift; \(N\) = Night shift.

References

Ghotbi, N., Pilz, L. K., Winnebeck, E. C., Vetter, C., Zerbini, G., Lenssen, D., Frighetto, G., Salamanca, M., Costa, R., Montagnese, S., & Roenneberg, T. (2020). The \(\mu\)MCTQ: an ultra-short version of the Munich ChronoType Questionnaire. Journal of Biological Rhythms, 35(1), 98-110. doi:10.1177/0748730419886986

Juda, M., Vetter, C., & Roenneberg, T. (2013). The Munich ChronoType Questionnaire for shift-workers (MCTQ\(^{Shift}\)). Journal of Biological Rhythms, 28(2), 130-140. doi:10.1177/0748730412475041

Roenneberg T., Allebrandt K. V., Merrow M., & Vetter C. (2012). Social jetlag and obesity. Current Biology, 22(10), 939-43. doi:10.1016/j.cub.2012.03.038

Roenneberg, T., Wirz-Justice, A., & Merrow, M. (2003). Life between clocks: daily temporal patterns of human chronotypes. Journal of Biological Rhythms, 18(1), 80-90. doi:10.1177/0748730402239679

The Worldwide Experimental Platform (n.d.). MCTQ. https://www.thewep.org/documentations/mctq/

See also

Other MCTQ functions: fd(), gu(), le_week(), msf_sc(), msl(), napd(), sd24(), sd_overall(), sd_week(), sdu(), sjl(), sjl_sc(), sjl_weighted(), so()

Examples

## Scalar example

bt <- hms::parse_hm("22:10")
gu <- hms::parse_hm("06:15")
tbt(bt, gu)
#> [1] "29100s (~8.08 hours)"
#> [1] "29100s (~8.08 hours)" # Expected

bt <- hms::parse_hm("01:20")
gu <- hms::parse_hm("14:00")
tbt(bt, gu)
#> [1] "45600s (~12.67 hours)"
#> [1] "45600s (~12.67 hours)" # Expected

bt <- hms::as_hms(NA)
gu <- hms::parse_hm("07:20")
tbt(bt, gu)
#> [1] NA
#> [1] NA # Expected

## Vector example

bt <- c(hms::parse_hm("23:50"), hms::parse_hm("02:30"))
gu <- c(hms::parse_hm("09:30"), hms::parse_hm("11:25"))
tbt(bt, gu)
#> [1] "34800s (~9.67 hours)" "32100s (~8.92 hours)"
#> [1] "34800s (~9.67 hours)" "32100s (~8.92 hours)" # Expected