Table 1.

Questionnaire underlying the constipation-scoring algorithm, modified based on [34].

Question	Answer	Score
Frequency of bowel movements	1–2 times per 1–2 days	0
	2 times per week	1
	once per week	2
	<once per week	3
	<once per month	4
Difficulty of evacuation (painful)	Never	0
	Rarely	1
	Sometimes	2
	Usually	3
	Always	4
Incomplete feeling of evacuation	Never	0
	Rarely	1
	Sometimes	2
	Usually	3
	Always	4
Abdominal pain	Never	0
	Rarely	1
	Sometimes	2
	Usually	3
	Always	4
Minutes spent in lavatory per attempt	<5 min	0
	5–10 min	1
	10–20 min	2
	20–30 min	3
	>30 min	4
Assistance: type of assistance	Without assistance	0
	Simulative laxatives	1
	Digital assistance or aenema	2
Unsuccessful attempts for evacuation/24 h	Never	0
	1–3	1
	3–6	2
	6–9	3
	>9	4
Duration of constipation	0	0
	1–5 years	1
	5–10 years	2
	10–20 years	3
	>20 years	4
Total sum	30