condition mean min max ZT0-3 17.121425000000002 12.445699999999999 21.797150000000002 ZT4-7 30.53365 30.53365 30.53365 ZT8-11 11.753875 11.753875 11.753875 ZT12-15 0 0 0 ZT16-19 10.541129999999999 10.541129999999999 10.541129999999999 ZT20-23 22.3675 22.3675 22.3675