Table 1 Age-specific varicella-zoster virus seroprevalence (%, 95 % CI) among a subset of Norwegian population (n = 2,103)

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