condition mean min max ZT0-3 138.390685 138.390685 138.390685 ZT4-7 129.589605 129.589605 129.589605 ZT8-11 87.26032699999999 87.26032699999999 87.26032699999999 ZT12-15 75.49519749999999 75.49519749999999 75.49519749999999 ZT16-19 33.514024 33.514024 33.514024 ZT20-23 36.7080075 36.7080075 36.7080075