[pwnna]

It definitely is not a big sample size. However, considering that 200 people participated in the study for this many years.. I would say it is a big sample size just in terms of practicality (how many people would agree to participate in this? This study essentially becomes a part of their lives.. for all the time they live.)

[ekianjo]

Yeah, the profile of people who would agree to participate in this study is certainly "biased". Not sure what you can do with the results.

[pwnna]

This may be true, but I'm not sure how they are biased (what factors? Are these men more likely to be married because they're willing to go through such a study? More likely to not..).

[Bsharp]

Size isn't the only consideration.

If you sample 10,000 professional athletes, are you getting a sample population which represents 9-5ers and couch potatoes too?

[devgutt]

and this is really sad