condition mean min max ZT0-3 5.7488166666666665 1.218105 8.0184 ZT4-7 4.33187 4.33187 4.33187 ZT8-11 0.0 0.0 0.0 ZT12-15 2.8762825 1.089695 4.66287 ZT16-19 4.171195 4.171195 4.171195 ZT20-23 1.220345 1.220345 1.220345