Joey jojo - the issue is one of trust. Just like WT's 1914 a message can be spun from statistics which is religious. In this case the value is health. But what are the facts. How reliable are the facts? The figures that go into the statistics - how can you PROVE they are reliable?
Some ideas to ensure the data is ok - get the figures sent to you. Process it yourself. Have the details of every individual used in the data. Ensure all individuals in the data are actually still alive (or have been born). Scrutinized the figures to ensure demical points are in the right place. Make sure odd 0s haven't been added here and there.
When receiving data - check the figures looks comparable to at least 3 years worth of exactly the same data - maybe more - try 16 years just in case. If certain numbers are way out, make a phone call to the person who sent it and patiently stand up to them until (having abused you to within an inch of your life) they finally admit they lied to you through their teeth.