Table 1.
Characteristics of 560 Eligible Patients With Both Chickenpox and a Stroke (or Transient Ischemic Attack) During Follow-up
| Characteristic | GPRD |
THIN |
QResearch |
IMS |
Total |
|||||
|---|---|---|---|---|---|---|---|---|---|---|
| <18 y at Index Date | ≥18 y at Index Date | <18 y at Index Date | ≥18 y at Index Date | <18 y at Index Date | ≥18 y at Index Date | <18 y at Index Date | ≥18 y at Index Date | <18 y at Index Date | ≥18 y at Index Date | |
| (n = 17) | (n = 219) | (n = 4) | (n = 79) | (n = 26) | (n = 84) | (n = 13) | (n = 118) | (n = 60) | (N = 500) | |
| Age at index datea, y, median (IQR) | 4.3 (1.8–6.4) | 62.5 (49.0–75.0) | 2.1 (1.5–3.0) | 64.8 (49.8–76.7) | 4.6 (2.2–11.2) | 61.3 (51.0–72.0) | 3.8 (2.1–6.3) | 63.8 (48.4–75.5) | 3.9 (1.9–6.4) | 62.9 (49.2–75.4) |
| Male sex, No. (%) | 11 (64.7) | 127 (58.0) | 4 (100) | 36 (45.6) | 12 (46.2) | 41 (48.8) | 7 (53.9) | 63 (53.4) | 34 (56.7) | 267 (53.4) |
| Total observationb, y, median (IQR) | 6.7 (4.8–12.1) | 13.1 (9.6–18.7) | 5.8 (4.9–7.3) | 15.7 (10.7–18.9) | 6.3 (3.4–11.2) | 11.8 (8.8–14.9) | 9.3 (5.2–12.7) | 17.7 (12.9–20.0) | 6.6 (4.7–11.7) | 14.2 (9.9–18.8) |
| TIAc, No. (%) | 1 (5.9) | 113 (51.6) | 0 (0) | 38 (48.1) | 6 (23.1) | 43 (51.2) | 4 (30.8) | 65 (55.1) | 11 (18.3) | 259 (51.8) |
| Stroke, No. (%) | 16 (94.1) | 106 (48.4) | 4 (100) | 41 (51.9) | 20 (76.9) | 41 (48.8) | 9 (69.2) | 53 (44.9) | 49 (81.7) | 241 (48.2) |
Abbreviations: GPRD, General Practice Research Database; THIN, The Health Improvement Network; TIA, transient ischemic attack.
a Index date is the date of first stroke or TIA episode in study period.
b Observation is the follow-up during study period.
c Only TIA diagnostic codes were recorded for the illness episode.