I don't have these numbers. But one thing that is complicated here—because your question is totally relevant and to the point—is that on the other side as well, pursuing a work activity contributes to their facing these chronic conditions. So it has to be disentangled. That's why at this point in time the complex relationship between how being healthy is associated with continued work activity or how continued work activity contributes to staying healthy have not been disentangled, and that's why we support this Canadian longitudinal study on aging.
On May 28th, 2013. See this statement in context.