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Table 2 Parameter estimates, incidence estimates and 95% confidence intervals (based on both the original and imputed data), Lazio, Italy, 2004-2008

From: HIV incidence estimate combining HIV/AIDS surveillance, testing history information and HIV test to identify recent infections in Lazio, Italy

 

Original data

Imputed data†

 

Repeat testers

New testers

Repeat testers

New testers

r

190

55

620

301

p 1

0.522

0.136

0.398

0.205

p 2

0.696

0.585

1

1

Incidence estimate

946

1,250

2,818

2,647

(95% CI)

(857-1,035)

(966-1,534)

(2,305-3,426)

(1,739-3,593)

Diagnoses

790

815

1,646

1,987

Total incidence estimate (95% CI)

4,968

(4,356-5,441)

5,465

(4,538-6,461)

Estimated incidence rate*

21.1

23.8

  1. * per 100,000 person-years; estimates refer to the mean population (aged 15 or older) in the region of Lazio during the period 2004-2008.
  2. †mean values from 20 imputations.
  3. P3 = 202/365.25 = 0.553.
  4. CI, Confidence Interval.
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BMC Infectious Diseases

ISSN: 1471-2334

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