condition mean min max ZT0-3 2.6760099999999998 2.431645 2.920375 ZT4-7 1.929685 1.929685 1.929685 ZT8-11 1.94129 1.94129 1.94129 ZT12-15 0 0 0 ZT16-19 2.614685 2.614685 2.614685 ZT20-23 2.729725 2.729725 2.729725