condition mean min max ZT0-3 225.16716666666667 166.04500000000002 301.486 ZT4-7 126.458 126.458 126.458 ZT8-11 3.7673249999999996 3.7673249999999996 3.7673249999999996 ZT12-15 24.128974999999997 22.14095 26.116999999999997 ZT16-19 26.19765 26.19765 26.19765 ZT20-23 75.9231 75.9231 75.9231