The Eating Disorder Examination-Questionnaire (EDE-Q) is a well-established self-report questionnaire for the comprehensive assessment of eating disorder (ED) psychopathology. It is based on the Eating Disorder Examination (EDE2), a structured clinical interview, considered the method of choice for diagnosis and assessment of EDs. EDE-Q8 is a short form containing 8 items (Kliem et al. 2016).

scoring_edeq8(data, items = 1:8, keep = TRUE, nvalid = 4, digits = NULL)

Arguments

data

a data.frame containing the EDE-Q8 items orderd from 1 to 8

items

A character vector with the EDE-Q8 item names ordered from 1 to 8, or a numeric vector indicating the column numbers of the EDE-Q8 items in data.

keep

Logical, whether to keep the single items and whether to return variables containing the number of non-missing items on each scale for each respondent. The default is TRUE.

nvalid

A numeric value indicating the number of non-missing items required for score calculations. The default is 4.

digits

Integer of length one: value to round to. No rounding by default.

Value

The function returns 2 variables:

  • nvalid.edeq: Number of valid values (MAX=8)

  • score.edeq: EDE-Q8 Score

Details

  • Number of items: 8

  • Item range: 0 to 6

  • Reverse items: none

  • Score range: 0 to 6

  • Cut-off-values: none

  • Minimal clinically important difference: none

  • Treatment of missing values: At least 4 valid items are required for calculating the score (Hilbert, Tuschen-Caffier 2016)

References

Kliem et al. 2016 (http://doi.wiley.com/10.1002/eat.22487)

Hilbert, Tuschen-Caffier 2016 (http://dgvt-verlag.de/e-books/2_Hilbert_Tuschen-Caffier_EDE-Q_2016.pdf)

Examples

if (FALSE) { library(dplyr) items.edeq8 <- paste0("EDEQ_", seq(1, 8, 1)) scoring_edeq8(mydata, items = items.edeq8) }