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. 2007 Jul 18;2007(3):CD004487. doi: 10.1002/14651858.CD004487.pub2

Cooper 1980.

Methods Randomised, parallel group, double blind study
Participants 298 participants randomised to 6 groups, withdrawals unclear (51 from all groups)
 Number randomised to intervention: male 13, female 24, mean age 22.5
 Number randomised to placebo: male 11, female 27, mean age 23.5
 Number of third molars removed: mean for intervention and placebo 1.9
 Baseline pain intensity: mean for intervention 2.41 (moderate 22, severe 15), mean for placebo 2.42 (moderate 22, severe 16)
 Setting ‐ outpatients (USA)
Interventions Paracetamol 500 mg versus placebo
 Formulation not stated
 Anaesthesia: not stated
Outcomes PI at 4 hours: categorical scale 0‐3 (none ‐ severe)
 PR at 4 hours: categorical scale 0‐4 (none ‐ complete)
 Global assessment: categorical scale 0‐4 (poor ‐ excellent)
 Adverse events table
Notes Sponsored unclear
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Unclear risk B ‐ Unclear