如果如你所说中国的数据这么明显不可靠，WHO有自己的核查手段

World Health Statistics 2007 has been collated from publications and databases produced by WHO’s technical programmes and regional offices. The core set of indicators was selected on the basis of their relevance to global health, the availability and quality of the data, and the accuracy and comparability of estimates. The statistics for the indicators are derived from an interactive process of data collection, compilation, quality assessment and estimation occurring among WHO’s technical programmes and its Member States. During this process, WHO strives to maximize the accessibility, accuracy, comparability and transparency of health statistics.

http://www.who.int/whosis/en/