condition mean min max ZT0-3 31.00605 17.6601 39.152699999999996 ZT4-7 22.39605 22.39605 22.39605 ZT8-11 38.14775 38.14775 38.14775 ZT12-15 44.47225 41.89595 47.048550000000006 ZT16-19 42.32635 42.32635 42.32635 ZT20-23 54.8273 54.8273 54.8273