condition mean min max ZT0-3 0.7593198333333333 0.652138 0.9390685000000001 ZT4-7 0.9185555 0.9185555 0.9185555 ZT8-11 1.155194 1.155194 1.155194 ZT12-15 1.4765675 1.4382000000000001 1.514935 ZT16-19 0.9387945 0.9387945 0.9387945 ZT20-23 0.9451195 0.9451195 0.9451195