Morrell 1986.

Methods	NRCT. Non‐randomised to surgery sessions with 5‐, 7.5‐, or 10‐minute appointments
Participants	1 practice; 5 doctors; 60 surgery sessions; 780 consultations
Interventions	5‐, 7.5‐, and 10‐minute appointments (usual appointment length 6.7 min)
Outcomes	Consultation length, examination, prescribing and referral, investigation rates, number of problems and psychological problems identified, language content; re‐consultation in 4 weeks
Notes	Analysis: Logistic regression allowing for age and sex of patient. As case mix varied between groups, doctor‐ and patient‐initiated consultations were analysed separately for several outcomes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Sequential allocation of patients to 1 of 3 arms
Allocation concealment (selection bias)	High risk	Sequential allocation of patients to 1 of 3 arms
Blinding (performance bias and detection bias) All outcomes	High risk	Non‐blinded assessment
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Blinding for personnel implementing the intervention not possible
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Objective outcome (consultation length)
Incomplete outcome data (attrition bias) All outcomes	Low risk	Data obtained for 96% of consenting participants
Selective reporting (reporting bias)	Low risk	No protocol found; all prespecified outcomes are reported
Other bias	High risk	No baseline measurements (pre‐clinical data for patient characteristics) Selection bias ‐ more acute illness