Development and validation of a patient-reported questionnaire assessing systemic therapy induced diarrhea in oncology patients

Table 6 Scoring system of STIDAT

Components	Proportion explaining diarrhea	Score calculation
Factor 1: Patient’s perception of diarrhea
Presence of diarrhea	0.193	N¹ × 0.193
Severity of diarrhea	0.529	N² × 0.529
Presence of urgency	0.048	N¹ × 0.048
Factor 2: Bowel movement frequency
Number of bowel movements	0.050	N³ × 0.050
Number of diarrhea episodes	0.161	N³ × 0.161
Medication use	0.060	N¹ × 0.060
Quality of life	−0.048	Average N_1–5 x − 0.048
Factor 3: Fecal incontinence
Presence of fecal incontinence	0.016	N¹ × 0.016
Factor 4: Abdominal symptoms
Presence of abdominal spasms	0.032	N¹ × 0.032
Presence of abdominal discomfort	0.031	N¹ × 0.031
TOTAL		Sum of component scores +0.48^*

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