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

Tan 1986.

Methods Design: three group parallel trial 
 Purpose: examine the effect of cognitive‐behaviour therapy on psycho‐social problems and seizure control in epileptic patients
Participants Patients: epileptic out‐patients with psycho‐social problems (anxiety, depression) and inadequate seizure control 
 Baseline comparability: yes
Interventions Placebo: sessions of supportive group counselling or discussion with no specific cognitive‐behaviour therapy 
 Untreated: no sessions 
 Experimental: sessions of behavioural‐cognitive therapy 
 (Co‐intervention: 
 ‐'professional counselling or psychiatric treatment' to all but 6 patients 
 ‐anticonvulsant medication. The difference in serum‐level between the groups was not significant.)
Outcomes Number of patients with improvement in seizure frequency (frequency diary) 
 Seizure rating by blinded observer 
 Global rating of psycho‐social adjustment
Notes  
Risk of bias
Bias Authors' judgement Support for judgement
Adequate sequence generation? Unclear risk NS
Allocation concealment? Unclear risk NS
Blinding? 
 Treatment provider High risk Not described as double‐blind (placebo/behavioural cognitive training)
Blinding? 
 Outcome assessor Unclear risk Not relevant as patient reported outcome
Incomplete outcome data addressed? 
 All outcomes Low risk Drop‐out < 15%
Free of selective reporting? Unclear risk No protocol available
Free of other bias? Low risk  
No signs of variance inequality or skewness? Unclear risk Not relevant (binary outcome)
Trial size > 49? High risk N = 19
Clearly concealed allocation + trial size > 49 + drop‐out max 15% High risk Trials size < 49