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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.