condition mean min max ZT0-3 31.534766666666666 23.0867 38.6626 ZT4-7 20.50275 20.50275 20.50275 ZT8-11 20.37325 20.37325 20.37325 ZT12-15 25.105649999999997 23.27815 26.933149999999998 ZT16-19 25.9827 25.9827 25.9827 ZT20-23 39.113299999999995 39.113299999999995 39.113299999999995