Annex 2. Methods
A.2.1 Monitoring the global TB epidemic and progress in TB control (1995-2006)
A2.1.1 Data collection and verification
Every year, WHO requests information from NTPs or relevant public health authorities in 212 countries or territories via a standard data collection form.1 The latest form was distributed in mid-2007. The section on monitoring and surveillance requested data including the following: TB case notifications in 2006 (from DOTS and non-DOTS areas, each with 12 categories; new pulmonary smear-positive cases by age and sex); TB patients tested for HIV and MDR-TB in 2006; and treatment outcomes for TB patients registered during 2005 (DOTS, non-DOTS, HIV-infected, each with seven categories) and MDR-TB patients registered during 2003 (GLC-approved and other, each with three categories). The main case definitions are given in Table A2.1.
The data collection form used in the WHO European Region asked for additional data, including a breakdown of all TB cases by age, geographical origin (e.g. born outside country/non-citizen), and result of mycobacterial culture testing; and HIV-positive TB cases by sex and age.
NTPs that respond to WHO are also asked to update information for earlier years where possible. As a result of such revisions, the data (case notifications, treatment outcomes, etc.) presented in this report for years preceding 2005 and 2006 may differ from those published in previous reports.
The standard data collection form is used to compile aggregated national data. The process of national and international reporting is distinct from WHO’s recommendations about procedures for recording and reporting data by NTPs within countries, from district level upwards.2
Completed forms are collected and reviewed at all levels of WHO, by country offices, regional offices and at headquarters. An acknowledgement form that tabulates all submitted data is sent back to the NTP correspondent in order to complete any missing responses and to resolve any inconsistencies. Then, using the complete set of data for each country, we construct a profile that tabulates all key indicators, including epidemiological and financial data and estimates, and this too is returned to each NTP for review. In the WHO European Region only, data collection and verification are performed jointly by the regional office and a WHO collaborating centre, EuroTB (Paris). EuroTB subsequently publishes an annual report with additional analyses, using more detailed data for the European Region (www.eurotb.org).