Table 2: Percentage of head injury (1996 and 1998) in Taiwan.

VariableBefore the helmet use law After the helmet use law% Change value

Percentage of head injury a0.0812%0.0813% 0.1232%

Geographic locations<0.0001
 North0.0461%0.0356%−22.8046%
 Center0.0703%0.0796%13.1933%
 South0.1058%0.1201%13.4863%
 East0.0544%0.0705%29.6525%

Gender<0.0001
 Male0.0949%0.1008%6.1654%
 Female0.0688%0.0637%−7.4226%

Age<0.001
 Children0.0106%0.0100%−6.0954%
 Adult 15–240.1899%0.1603%−15.5572%
 Adult 25–640.0797%0.0886%11.1168%
 Elderly0.0797%0.0803%0.8056%

Rural/urban<0.001
 Special municipality0.0506%0.0465%−8.2351%
 City0.0607%0.0474%−21.9082%
 County administered0.0724%0.0710%−1.8142%
 Town0.1168%0.1719%47.2089%
 Village0.1134%0.0919%−18.9339%

Observations = 1,809,237 (before law in 1996 = 888,179; after law in 1998 = 921,058); number of head injury = 1,254 (before law = 609; after law = 645).