Domurath 2011

Methods	DESIGN: Randomised controlled cross‐over trial BLINDING PROCEDURES: Single blind (trial nurse) SAMPLE CALCULATION: Yes DURATION: 1 day WITHDRAWALS/DROPOUTS: 1 ITT: Not applicable GEOGRAPHICAL LOCATION: Three trial sites in Germany SETTING: Not stated
Participants	N = 37 DIAGNOSIS: Spinal cord injury ELIGIBLE: 37 ENROLLED: 37 COMPLETED: 36 AGE: Adults GENDER: Male
Interventions	Short length male hydrophilic‐coated catheter (activated) versus standard length male hydrophilic‐coated catheter (activated)
Outcomes	Residual urine and user satisfaction
Notes	Two observations of visible bleeding on test catheter
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"Crossover design, randomized in permuted blocks"
Allocation concealment (selection bias)	Unclear risk	Not stated
Blinding of participants and personnel (performance bias) All outcomes	Low risk	No blinding of participants, but risk of performance bias considered low as cross‐over trial. Blinding of trial nurse throughout all measurement procedures.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Participant‐reported outcome ‐ risk of detection bias unclear
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	1 withdrawal reported because the participant "did not consider the 'test' catheter material flexible enough"
Source of Funding	Unclear risk	Coloplast A/S.