condition mean min max ZT0-3 19.344375 18.28785 20.4009 ZT4-7 15.899550000000001 15.899550000000001 15.899550000000001 ZT8-11 10.485355 10.485355 10.485355 ZT12-15 0 0 0 ZT16-19 10.457325 10.457325 10.457325 ZT20-23 19.25865 19.25865 19.25865