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. 2010 Jan 20;2010(1):CD003974. doi: 10.1002/14651858.CD003974.pub3

Pearl 1956.

Methods Design: three group parallel trial 
 Purpose: examine the effect of reserpine on schizophrenic patients
Participants Patients: in‐patients with schizophrenia 
 Baseline comparability: NS
Interventions Placebo: NS 
 Untreated: no reserpine or placebo 
 Experimental: reserpine 
 (Co‐intervention: institutionalised patients, beside that NS)
Outcomes Multidimensional Scale for Rating Psychiatric Patients
Notes Relevant outcome data not accessible
Risk of bias
Bias Authors' judgement Support for judgement
Adequate sequence generation? Unclear risk NS
Allocation concealment? Unclear risk NS
Blinding? 
 Treatment provider Low risk 'Except for the ward psychiatrist and nurse, no personnel involved were aware of patient's treatment. Persons dispensing the placebo were told it was a variant of reserpine'
Blinding? 
 Outcome assessor Unclear risk NS
Incomplete outcome data addressed? 
 All outcomes High risk Drop‐out > 15% or NS
Free of selective reporting? High risk Relevant outcome data not accessible
Free of other bias? Low risk  
Trial size > 49? Low risk N = 100
Clearly concealed allocation + trial size > 49 + drop‐out max 15% High risk Drop‐out > 15% or NS