From: Searching for the optimal number of response alternatives for the distress scale of the four-dimensional symptom questionnaire
Χ2
df
p
Nagelkerke R2
Short term
DIS 0–2
10.9
1
.001
.050
DIS 0–4
15.0
.071
Long term
4.5
.035
.023
3.9
.047
.021