TABLE 1

Age at Vaccination, Number of Seizures, and the Number of Doses Administered in Each of 3 Time Periods According to Vaccine Received: VSD Study Population, 2000–2008

MMRV (n = 83 107)MMR + Varicella (n = 376 354)MMR Alone (n = 145 302)Varicella Alone (n = 107 744)All (N = 712 507)
Age at vaccination, n (%)
    12 mo44 182 (53.2)192 912 (51.3)57 217 (39.4)27 452 (25.5)321 763 (45.2)
    13–14 mo19 534 (23.5)92 117 (24.5)27 737 (19.1)14 381 (13.3)153 769 (21.6)
    15–16 mo11 319 (13.6)59 254 (15.7)37 718 (26)31 702 (29.4)139 993 (19.6)
    17–19 mo5292 (6.4)21 723 (5.8)15 571 (10.7)23 923 (22.2)66 509 (9.3)
    20–23 mo2780 (3.3)10 348 (2.7)7059 (4.9)10 286 (9.5)30 473 (4.3)
Seizures 0–42 d, n1895981511291067
Seizures 7–10 d, n771744215308
Doses administered between 2000 and November 2003, n (%)1134 (1.4)205 572 (54.6)95 470 (65.7)64 520 (59.9)366 696 (51.5)
Doses administered between December 2003 and January 2006, n (%)149 (0.2)105 629 (28.1)32 039 (22.0)26 475 (24.6)164 292 (23.1)
Doses administered between February 2006 and October 2008, n (%)81 824 (98.5)65 153 (17.3)17 793 (12.2)16 749 (15.5)181 519 (25.5)