Kellner 1992.

Methods	Allocation: Randomised controlled trial, randomisation procedure not described and allocation concealment unclear; Duration: not described; No follow‐up period; Patient blinding: not possible; Outcome blinding: procedure not described, bias seems possible, cannot be excluded; Intention to treat analysis not mentioned, none of the participants dropped out of treatment.
Participants	Diagnosis: DSM‐III criteria for major depression; Age 53‐87 years; participants had been referred for ECT treatment, no information is provided on earlier antidepressant treatment in any of the participants; N = 15; Sex: 11M and 4F
Interventions	ECT once a week versus three‐times‐weekly ECT; bilateral treatment in all participants; method of seizure induction adequately described
Outcomes	Mood change: Hamilton Rating Scale for Depression (HAM‐D), the Beck Depression Inventory (BDI), the Clinical Global Improvement Scale (CGI) and the Brief Psychiatric Rating Scale (BPRS) Cognitive side effects: Mini Mental Status Examination (MMSE) and the Wechsler Memory Scale‐Revised (WMS‐R)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear