condition mean min max ZT0-3 0.63067325 0.509652 0.7516944999999999 ZT4-7 1.28029 1.28029 1.28029 ZT8-11 3.22473 3.22473 3.22473 ZT12-15 0 0 0 ZT16-19 2.35421 2.35421 2.35421 ZT20-23 1.05779 1.05779 1.05779