condition mean min max ZT0-3 4.9568 4.202085 5.711515 ZT4-7 3.67302 3.67302 3.67302 ZT8-11 0.745987 0.745987 0.745987 ZT12-15 0 0 0 ZT16-19 2.066845 2.066845 2.066845 ZT20-23 7.95979 7.95979 7.95979