A study of grass-roots workers in an enterprise shows that grass-roots workers who use social software are significantly less likely to suffer from diabetes, mental illness and ischemic heart disease than those who do not use social software. Accordingly, the managers of the company believe that the use of social software is beneficial to the health of grass-roots workers.
The statement 'The grass-roots workers of the enterprise are generally over the age of 40, and a considerable number of people do not use social software' will most weaken the above managers' conclusions.