Table 1.
Age-specific varicella-zoster virus seroprevalence (%, 95 % CI) among a subset of Norwegian population (n = 2,103)
| Age group | Positive | Negative | Equivocal | |||
|---|---|---|---|---|---|---|
| % (No of samples) | 95 % CI | % (No of samples) | 95 % CI | % (No of samples) | 95 % CI | |
| 0 y | 58.9 (56) | 48.8–68.4 | 29.5 (28) | 21.1–39.4 | 11.6 (11) | 6.5–19.8 |
| 1 y | 11.2 (12) | 6.5–18.8 | 86.9 (93) | 79.1–92.1 | 1.9 (2) | 0.5–7.2 |
| 2 y | 16.3 (17) | 10.4–24.8 | 77.9 (81) | 68.9–84.9 | 5.8 (6) | 2.6–12.3 |
| 3 y | 40.2 (41) | 31.1–50.0 | 55.9 (57) | 46.1–65.2 | 3.9 (4) | 1.5–10.0 |
| 4 y | 48.5 (49) | 38.9–58.2 | 50.5 (51) | 40.8–60.2 | 1.0 (1) | 0.1–6.8 |
| 5 y | 65.3 (66) | 55.5–74.0 | 33.7 (34) | 25.1–43.5 | 1.0 (1) | 0.1–6.8 |
| 6 y | 69.8 (67) | 59.8–78.2 | 26.0 (25) | 18.2–35.8 | 4.2 (4) | 1.6–10.6 |
| 7 y | 71.4 (70) | 61.7–79.5 | 24.5 (24) | 17.0–34.0 | 4.1 (4) | 1.5–10.4 |
| 8 y | 82.8 (82) | 74.0–89.1 | 15.2 (15) | 9.3–23.7 | 2.0 (2) | 0.5–7.8 |
| 9 y | 78.1 (75) | 68.7–85.3 | 16.7 (16) | 10.4–25.5 | 5.2 (5) | 2.2–12.0 |
| 10–14 y | 81.4 (118) | 74.2–86.9 | 11.7 (17) | 7.4–18.1 | 6.9 (10) | 3.7–12.4 |
| 15–19 y | 89.5 (94) | 82.0–94.1 | 4.8 (5) | 2.0–11.0 | 5.7 (6) | 2.6–12.2 |
| 20–24 y | 86.4 (89) | 78.3–91.8 | 8.7 (9) | 4.6–16.0 | 4.9 (5) | 2.0–11.2 |
| 25–29 y | 90.0 (81) | 81.8–94.7 | 10.0 (9) | 5.3–18.2 | 0 (0) | - |
| 30–34 y | 91.9 (79) | 83.8–96.1 | 2.3 (2) | 0.6–8.9 | 5.8 (5) | 2.4–13.3 |
| 35–39 y | 95.7 (90) | 89.1–98.4 | 1.1 (1) | 0.1–7.2 | 3.2 (3) | 1.0–9.5 |
| 40–44 y | 91.8 (89) | 84.3–95.8 | 1.0 (1) | 0.1–7.0 | 7.2 (7) | 3.5–14.4 |
| 45–49 y | 94.8 (91) | 88.0–97.8 | 3.1 (3) | 1.0–9.3 | 2.1 (2) | 0.5–8.0 |
| 50–59 y | 95.9 (94) | 89.6–98.5 | 3.1 (3) | 1.0–9.1 | 1.0 (1) | 0.1–7.0 |
| 60–69 y | 95.8 (91) | 89.3–98.4 | 3.2 (3) | 1.0–9.4 | 1.1 (1) | 0.1–7.2 |
| 70+ y | 93.7 (89) | 86.6–97.1 | 1.1 (1) | 0.1–7.2 | 5.3 (5) | 2.2–12.1 |
| Total | 73.2 (1540) | 71.3–75.1 | 22.7 (478) | 21.0–24.6 | 4.0 (85) | 3.3–5.0 |