condition mean min max ZT0-3 18.303775 17.9204 18.687150000000003 ZT4-7 14.796 14.796 14.796 ZT8-11 30.6079 30.6079 30.6079 ZT12-15 0 0 0 ZT16-19 28.93095 28.93095 28.93095 ZT20-23 21.541649999999997 21.541649999999997 21.541649999999997