Statistical studies are relative to their SAMPLE SIZE. In general, the LARGER the sample size, the closer it gets to predicting the probabilities of the type of population the study is looking at.
If you really wanted to draw a conclusion from a statistical study, you would need to ferret out the exact study, look at the sample size and the type of population they used in the study. Statistical studies DON'T comprise the ENTIRE population of what ever type of group one is looking at, e.g. every patient that has had maxfax surgery.