condition mean min max ZT0-3 49.4393868 49.20903219 49.66974141 ZT4-7 44.6574634425 43.967892645 45.34703424 ZT8-11 81.624170635 61.71998216 101.52835911 ZT12-15 84.86075876250001 68.941028575 100.78048895 ZT16-19 63.8209091325 59.21589338 68.425924885 ZT20-23 51.0238218275 47.480099315000004 54.56754434