Yes, I would be happy to.
In my study I found that turnout is positively correlated with consensus democracy and proportionality. If you look at a large number of countries, obviously you can find individual instances of high turnout in FPTP countries, and perhaps relatively low turnout in consensus democracies, but when you look at countries overall, the correlation is very clear that PR countries have higher turnouts than FPTP countries.
There are two reasons for this—logical reasons that you would expect. One is that PR gives the voters more of a choice, so if a voter likes a small party, they are more likely to come out and vote for that small party, and they will perhaps not vote when, in fact, the candidate of that small party simply has no chance at all. The second reason is that if you have FPTP, you have a number of districts that are safe for one party or another party, and in that case the party that is disadvantaged in that particular district is not likely to make much of an effort in that district.