condition mean min max ZT0-3 30.053625 26.549100000000003 33.55815 ZT4-7 15.75555 15.75555 15.75555 ZT8-11 18.11225 18.11225 18.11225 ZT12-15 0 0 0 ZT16-19 24.03095 24.03095 24.03095 ZT20-23 31.3149 31.3149 31.3149