condition mean min max ZT0-3 2.6299025 2.6203 2.6395049999999998 ZT4-7 2.93369 2.93369 2.93369 ZT8-11 4.33591 4.33591 4.33591 ZT12-15 0 0 0 ZT16-19 4.7548449999999995 4.7548449999999995 4.7548449999999995 ZT20-23 4.029645 4.029645 4.029645