Table 1: 2 × 2 table showing accuracy of coding of cerebral palsy in Quebec health administrative databases*

Diagnosis in health administrative databases	Diagnosis in Registre de la paralysie cérébrale du Québec (gold standard); no. of cases
Diagnosis in health administrative databases	Present	Absent	Total
Present	197	138	335
Absent	104	163 561	163 655
Total	301	163 699	164 000

*Régie de l'assurance maladie du Québec and Maintenance et exploitation des données pour l'étude de la clientèle hospitalière.