condition mean min max ZT0-3 0.32769916666666665 0.25237 0.3960095 ZT4-7 0.4736165 0.4736165 0.4736165 ZT8-11 0.534014 0.534014 0.534014 ZT12-15 0.59845125 0.519943 0.6769594999999999 ZT16-19 0.776465 0.776465 0.776465 ZT20-23 0.372232 0.372232 0.372232