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Table 2 Age-specific incidence (cases per thousand) of herpes zoster and trends, Massachusetts, 1999–2003

From: The incidence of varicella and herpes zoster in Massachusetts as measured by the Behavioral Risk Factor Surveillance System (BRFSS) during a period of increasing varicella vaccine coverage, 1998–2003

Year

Parameter

Age group in years

  

1–24

25–44

45–64

65+

All ages, crude

All ages, standardized a

1999

       
 

nb

5655

4230

2214

911

13010

 
 

Cases

5

14

11

10

40

 
 

Incidence

0.87

1.87

4.82

6.9

2.23

2.77

 

95% CI

0.25–3.05

0.90–3.88

2.36–9.86

2.97–16.05

1.46–3.43

1.82–4.20

2000

       
 

nb

3668

3449

2211

1121

10449

 
 

Cases

2

12

13

8

35

 
 

Incidence

0.46

3.74

6.45

6.45

3.57

3.54

 

95% CI

0.11–1.91

2.04–6.76

3.60–11.29

3.04–13.16

2.50–5.08

2.48–5.03

2002

       
 

nb

3469

3234

2451

1303

10457

 
 

Cases

6

14

20

23

63

 
 

Incidence

1.70

5.13

7.42

20.03

6.51

6.47

 

95% CI

0.71–4.03

2.65–9.70

4.39–12.28

12.46–30.59

4.86–8.67

4.92–8.47

2003

       
 

nb

3698

3260

2700

1278

10936

 
 

Cases

8

16

18

14

56

 
 

Incidence

2.19

4.88

6.79

11.74

5.38

5.25

 

95% CI

1.05–4.50

2.86–8.20

4.02–11.23

6.57–20.12

4.03–7.14

3.96–6.94

1999–2003

       
 

% change for period

152%

161%

41%

70%

141%

90%

 

p for trend test

0.10

0.03

0.42

0.03

0.0001

0.0009

  1. a Incidence is standardized using the standard 2000 U.S. population. The p-value is from age-adjusted analysis for trend using logistic regression.
  2. b N's exclude individuals for whom age or herpes zoster status was missing. The number excluded for these reasons was 1011, 513, 887, and 506 in 1999, 2000, 2002, and 2003, respectively. Values for n's and numbers of cases are unweighted, whereas incidence rates and 95% confidence intervals are based on weighted analysis.
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BMC Public Health

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