Poser scale is kind of screwy. Originally, it didn't have an official scale. Though "1 PNU = 8.6 feet" became official with Poser 6, a lot of people kept using the unofficial old scale of 1PNU = 8ft. I believe this is the scale DAZ used, and still uses.

For the average user, it probably doesn't matter, but if you're doing something where it does matter, it's probably best to check. Things like props, etc. may not be the size you think they are.