1. postneonatal, and mild cases of cerebral palsy was probably more complete in recent years than in the earlier years. This did not seem to result in selectively better ascertainment of cases in infants of low birth weight. Also, there has recently been considerable effort to reduce interobserver variation in diagnosis of specific motor handicap in the register.'4 Since we believe that this has reduced diagnostic variation in infants born since 1975, the comparison of specific diagnostic categories before and after this time may be difficult
2. Methodology of a cerebral palsy register. The Western Australian experience;Stanley, F.J.; Watson, L.;Neuroepidemiology,1985
3. When perinatal caregivers enter the insurance business;Shearer, M.H.;Births,1986
4. Cerebral palsy, intrapartum care and a shot in the foot;Lancet,1989
5. No fault insurance in obstetrics;Fisher, C.C.;Medj Aust,1990