Assessment of risk of bias among pediatric randomized controlled trials.
OBJECTIVE
The goal was to assess the risk of bias among pediatric, randomized, controlled trials (RCTs) reported in 8 high-impact journals.


METHODS
We searched PubMed for all pediatric RCTs reported between July 1, 2007, and June 30, 2008, in 8 journals with high impact factors. Using Cochrane Collaboration methods for risk assessment, we evaluated all reports for risk of bias according to domain (ie, randomized sequence generation, allocation concealment, masking, incomplete outcome data, selective outcome reporting, and other). We used multiple logistic regression to test for associations between the presence of a high risk of bias according to domain and funding source, intervention type, trial registration, and multicenter status.


RESULTS
Industry-funded RCTs were more likely to show a high risk of bias for sequence generation, compared with government-funded RCTs (adjusted odds ratio [aOR]: 6.1 [95% confidence interval [CI]: 1.70- 21.89]), and behavioral/educational trials were more likely to show a high risk of bias for sequence generation (aOR: 2.8 [95% CI: 1.06-7.36]) and allocation concealment (aOR: 4.09 [95% CI: 1.69-9.90]), compared with drug trials. Registered trials were less likely to have a high risk of bias for sequence generation, compared with nonregistered trials (aOR: 0.33 [95% CI: 0.15-0.71]).


CONCLUSIONS
Overall, we found a large proportion of pediatric RCT reports with a high risk of bias for sequence generation and allocation concealment. Factors associated with a high risk of bias included industry funding and assessment of behavioral/educational interventions, whereas trial registration was associated with a lower risk of bias.
Crocetti
Michael T
MT
Department of Pediatrics,, Johns Hopkins Bayview Medical Center, Baltimore, MD 21224, USA. mcrocet1@jhmi.edu
Amin
Diane D
DD
Scherer
Roberta
R
D015982:Bias; D002648:Child; D006801:Humans; D007223:Infant; D015337:Multicenter Studies as Topic; D017594:Publication Bias; D011643:Publishing / Q000706:statistics & numerical data; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D012307:Risk Factors; D011795:Surveys and Questionnaires