condition mean min max ZT0-3 26.335816666666666 17.207250000000002 32.445 ZT4-7 12.20435 12.20435 12.20435 ZT8-11 46.505849999999995 46.505849999999995 46.505849999999995 ZT12-15 34.969225 31.17165 38.7668 ZT16-19 32.78685 32.78685 32.78685 ZT20-23 37.9898 37.9898 37.9898