condition mean min max ZT0-3 0.36655449999999995 0.0861955 0.6469134999999999 ZT4-7 0.4571695 0.4571695 0.4571695 ZT8-11 1.175677 1.175677 1.175677 ZT12-15 0 0 0 ZT16-19 1.5799699999999999 1.5799699999999999 1.5799699999999999 ZT20-23 0.737274 0.737274 0.737274