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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.