condition mean min max ZT0-3 3.5206925 3.2344850000000003 3.8068999999999997 ZT4-7 20.015349999999998 20.015349999999998 20.015349999999998 ZT8-11 42.3275 42.3275 42.3275 ZT12-15 0 0 0 ZT16-19 26.5801 26.5801 26.5801 ZT20-23 15.1516 15.1516 15.1516