Table 1 Summary of testing participation in the HIV survey and HIV incidence cohort.

From: Declines in HIV incidence among men and women in a South African population-based cohort

 HIV surveyaHIV incidence Ccohortb
Eligible/enumeratedcContact/eligibledTested/contactedeEver testfEligiblegRepeat-testersh
YearNo./total no.%No./total no.%No./total no.%%No.No.%
200525,203/26,477(95.2)22,105/25,203(87.7)9422/22,105(42.6)59.811,3969936(87.2)
200623,536/26,209(89.8)21,538/23,536(91.5)8643/21,538(40.1)61.813,97311,522(82.5)
200728,364/32,844(86.4)25,689/28,364(90.6)9957/25,689(38.8)60.416,06412,898(80.3)
200831,020/36,228(85.6)28,859/31,020(93.0)10,032/28,859(34.8)61.517,95814,163(78.9)
200927,077/32,072(84.4)24,795/27,077(91.6)8858/24,795(35.7)66.219,07414,816(77.7)
201032,173/34,968(92.0)26,520/32,173(82.4)11,228/26,520(42.3)68.021,48316,367(76.2)
201132,127/32,978(97.4)25,586/32,127(79.6)10,385/25,586(40.6)70.723,05217,242(74.8)
201230,506/32,327(94.4)23,145/30,506(75.9)7916/23,145(34.2)69.624,51918,199(74.2)
201330,768/32,964(93.3)24,840/30,768(80.7)9912/24,840(39.9)72.526,50019,482(73.5)
201431,225/33,013(94.6)24,471/31,225(78.4)9541/24,471(39.0)74.128,02720,532(73.3)
201530,509/32,211(94.7)27,085/30,509(88.8)13,096/27,085(48.4)78.030,14321,832(72.4)
201632,502/34,044(95.5)28,239/32,502(86.9)14,737/28,239(52.2)80.432,48122,943(70.6)
201731,687/34,542(91.7)26,240/31,687(82.8)11,430/26,240(43.6)80.533,83723,445(69.3)
Average (91.9) (85.4) (40.9)   (76.2)
  1. aTrained field workers visit all households in the surveillance area on an annual basis to take dried blood spots for HIV testing. Field workers also record data on whether participants were contacted and tested at the household visit
  2. bParticipants entered into the HIV incidence cohort if they had an earliest HIV-negative test result followed by at least one valid HIV test result
  3. cEnumerated refers to all individuals living in the household, as identified by a key household informant at the time of the field-worker visit. Eligibility was defined as being >15 years of age, mentally able, and a resident of the household. The column shows the number and percentage of enumerated individuals that were eligible for an HIV test
  4. dShows the number and percentage of eligible participants that were successfully contacted (i.e., that were present in the household) at the time of the field-worker visit
  5. eShows the number and percentage of contacted participants that were tested for HIV
  6. fShows the cumulative proportion of participants that tested at least once for HIV since the start of HIV testing in 2003
  7. gShows the cumulative number of HIV-negative participants since 2003 that were eligible for entry into the HIV incidence cohort in 2005
  8. hShows the number of eligible HIV-negative participants that had a repeat-test, entered the HIV cohort, and contributed person-time to the incidence analysis. For example, if a participant had a first and last HIV-negative test in 2006 and 2010, then he she is included in the year 2006, 2007, 2008, 2009, and 2010, irrespective of the number of missed tests during this exposure time. The last column gives the annual percentage of eligible HIV-negative participants that entered the HIV cohort