condition mean min max ZT0-3 23.16255 22.20695 24.11815 ZT4-7 9.922619999999998 9.922619999999998 9.922619999999998 ZT8-11 7.02744 7.02744 7.02744 ZT12-15 0 0 0 ZT16-19 15.7035 15.7035 15.7035 ZT20-23 16.3018 16.3018 16.3018