TABLE 2.
Characteristics of children with varicella and matched controls
| Clinical characteristics | Value |
P valuea | |
|---|---|---|---|
| Children with varicella (n = 106) | Controls (n = 106) | ||
| Age (yr) | |||
| Mean ± SD | 5.2 ± 2.9 | 5.2 ± 3.0 | |
| Median | 4 | 4 | |
| Range | 1–13 | 1–14 | |
| No. (%) of females | 50 (47.2) | 50 (47.2) | |
| No. (%) who received varicella vaccine | 100 (94.3) | 103 (97.2) | 0.3173 |
| No. (%) with varicella vaccination before 12 months of age | 0 (0.0) | 1 (1.2) | 0.4885 |
| No. (%) with varicella vaccination before 15 months of age | 75 (84.3) | 76 (90.5) | 0.2585 |
| Mean ± SD age at varicella vaccination (mo)b | 14.9 ± 9.2 | 13.3 ± 4.2 | 0.1403 |
| No. (%) who received varicella vaccine within 28 days of MMR vaccinec | 15 (21.7) | 41 (58.5) | <.0001 |
a
P values were obtained by McNemar's test except age at varicella vaccination, which was obtained by a paired t test.
b
The date of varicella vaccination was obtained in 89 children in the varicella group and 84 children in the control group.
c
Duration from MMR vaccination to varicella vaccination was obtained in 69 children in the varicella group and 70 children in the control group.