Scoring the Beck Depression Inventory (BDI and BDI-II)
scoring_bdi( data, items = 1:21, keep = TRUE, nvalid = 17, digits = NULL, version = "BDI-II" )
A character vector with the BDI item names ordered from 1 to 21,
or a numeric vector indicating the column numbers of the BDI items in
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.
A numeric value indicating the number of non-missing items required for score calculations. The default is 17.
Integer of length one: value to round to. No rounding by default.
A character vector with the BDI version, either "BDI-I" or "BDI-II" (default)
The function returns 4 variables:
nvalid.bdi: Number of valid values (MAX=21)
score.bdi: BDI score
cutoff.bdi: BDI as categorical variable
cutoff.bdi2: BDI-II as categorical variable
Number of items: 21
Item range: 0 to 3
Reverse items: none
Score range: 0 to 63
BDI: \(\le\) 10 = "minimal"; 11 to 18 = "mild"; 19 to 29 = "moderate"; \(\ge\) 30 = "severe"
BDI-II: \(\le\) 8 = "none", 9 to 13 = "minimal"; 14 to 19 = "mild"; 20 to 28 = "moderate"; \(\ge\) 29 = "severe"
Minimal clinically important difference: none
Treatment of missing values: Questionnaires with up to four missing values are scored,
replacing any missing values with the average score of the completed items.
Beck et al. 1961 (https://doi.org/10.1001%2Farchpsyc.1961.01710120031004)
Beck et al. 1996 (https://doi.org/10.1207%2Fs15327752jpa6703_13)