Table 5

 Comparison between patients having a normal CT scan and patients having an abnormal CT scan in 2002–03

Normal CT (n = 29)*Abnormal CT (n = 10)*Positive predictive value (%)Negative predictive value (%)
*Values are n (%).
CT, computed tomography; GA, general anaesthetic; GCS, Glasgow coma scale; NAI, non-accidental injury.
Mechanism unknown2 (7%)073
Fall >1 metre4 (14%)3 (30%)4378
Fall <1 metre9 (31%)1 (10%)1069
Fall down stairs2 (7%)073
Road traffic accident4 (14%)6 (60%)6086
Direct blow to head8 (28%)068
Loss of consciousness4 (14%)5 (50%)5683
Seizure1 (3%)2 (20%)6778
Vomiting8 (28%)068
Drowsiness2 (7%)6 (60%)7587
?NAI1 (3%)074
Amnesia02 (20%)10078
Headache01 (10%)10076
No abnormality9 (31%)1 (10%)1069
Facial haematoma3 (10%)1 (10%)2574
Facial laceration2 (7%)1 (10%)3375
Scalp haematoma8 (28%)2 (20%)2072
Scalp laceration1 (3%)074
Within 1 hour8 (28%)10 (100%)
2–4 hours9 (31%)0
Same day2 (7%)0
Next day5 (17%)0
Same week3 (10%)0
Next week2 (7%)0
Prior to GA1 (3%)074
Vomiting5 (17%)071
Confusion2 (7%)2 (20%)5077
Persistent headache7 (24%)069
Boggy haematoma3 (10%)1 (10%)2574
Reduced GCS5 (17%)9 (90%)6496
Seizure1 (3%)1 (10%)5076
Amnesia1 (3%)074
Worrying mechanism1 (3%)074
Collapse2 (7%)073
Irritability1 (3%)1 (10%)5076
Drowsiness6 (20%)3 (30%)3377
Dizziness2 (7%)073
?Base of skull fracture2 (7%)3 (30%)6080
Unknown2 (7%)073