condition mean min max ZT0-3 23.798099999999998 14.30345 30.1839 ZT4-7 22.1139 22.1139 22.1139 ZT8-11 16.56795 16.56795 16.56795 ZT12-15 14.087340000000001 10.63183 17.54285 ZT16-19 18.884349999999998 18.884349999999998 18.884349999999998 ZT20-23 29.3387 29.3387 29.3387