TABLE 3.

Number of Probable Febrile Seizure Cases and Incidence Rate Following Vaccination by Age in Months

Age (Months)	Vaccination Visits	Patients With “Convulsion” ICD-9 Code	Probable Febrile Seizure Cases
			Risk Interval, n (Rate*)	Control Interval, n (Rate*)
1	67,477	5	0	0
2	200,998	15	0	0
3	61,369	14	4(3.26)	0
4	202,299	34	7 (1.73)	2 (0.14)
5	53,199	4	2 (1.88)	0
TOTAL	585,342	72	13 (1.11)	2 (0.05)

Abbreviations:

ICD-9 = International Classification of Diseases, Ninth Revision

^*Incidence rate is per 100,000 person-days.