condition mean min max ZT0-3 41.358475 35.685 47.031949999999995 ZT4-7 49.19605 49.19605 49.19605 ZT8-11 62.68425 62.68425 62.68425 ZT12-15 0 0 0 ZT16-19 79.2928 79.2928 79.2928 ZT20-23 68.299 68.299 68.299