Table 1 Key secondary data sources for the synthesis of HIV epidemiological data for Tigrai

Demographic and Health Surveys (DHS)

DHS (with an HIV component with seroprevalence, knowledge and behavioural data) at two time points for residents of Tigrai in 2005 and 2011 were available. DHS data were sourced from MEASURE DHS. All prevalence and percentages provided are weighted (weights provided by DHS/Macro). All p-values are from tests comparing weighted proportions.

Antenatal Sentinel Surveillance

From unlinked anonymous surveys based on HIV testing performed on left over blood collected for routine syphilis testing at antenatal clinics for the period 2001 to 2009 was available from the Ethiopian Health and Nutrition Research Institute. Data specimens were collected from 11 sites in Tigrai in 2009 (seven rural and four urban).

Routine Prevention of Mother-to-Child Transmission (PMTCT) Testing Data

Compiled and availed by the Tigrai Health Bureau. 101 health facilities in Tigrai were mapped and classified as urban or rural and according to risk factors present in their catchment areas. Data was available at health facility level for the period 2008/09 to 2010/11.

Routine HIV Counselling and Testing (HCT) and Provider Initiated Counselling and Testing (PICT) Data

Compiled by the Tigrai Health Bureau for the period 2008/09 to 2010/11 were analysed. HCT and PICT data were available at district level.