condition mean min max ZT0-3 1.11104825 0.7213505 1.500746 ZT4-7 1.092207 1.092207 1.092207 ZT8-11 0.358639 0.358639 0.358639 ZT12-15 0 0 0 ZT16-19 0.6391155 0.6391155 0.6391155 ZT20-23 0.641932 0.641932 0.641932