condition mean min max ZT0-3 0.5262135 0.48039699999999996 0.57203 ZT4-7 0.6575325 0.6575325 0.6575325 ZT8-11 0.4893865 0.4893865 0.4893865 ZT12-15 0 0 0 ZT16-19 1.044775 1.044775 1.044775 ZT20-23 0.890053 0.890053 0.890053