condition mean min max ZT0-3 17.472234673000003 14.388480346000001 20.555989 ZT4-7 11.186969962 8.750200829 13.623739095 ZT8-11 16.518215425 14.831620305 18.204810545 ZT12-15 20.1137883575 16.93197405 23.295602664999997 ZT16-19 24.714218465000002 21.459890005 27.968546925000002 ZT20-23 38.6126317075 34.386877765 42.83838565