Table 2

 Results of meta-analysis

VariableRelative riskNo. of patients includedNo. of studies included95% CIHeterogeneity*
*A p value of >0.1 accepts the hypothesis that each study has taken samples from the same background population.
Skull fracture6.1322420153.35 to 11.2p < 0.0005
Headache1.02113640.620 to 1.69p = 0.524
Vomiting0.8781409270.673 to 1.15p = 0.779
Focal neurology9.43170752.89 to 30.8p < 0.0005
Seizure2.821409270.89 to 9.00p < 0.0005
Loss of consciousness2.23241581.20 to 4.16p = 0.004
GCS <155.5119146101.59 to 19.0p < 0.0005