condition mean min max ZT0-3 28.079075 26.38995 29.7682 ZT4-7 2.1574299999999997 2.1574299999999997 2.1574299999999997 ZT8-11 0.1276227 0.1276227 0.1276227 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 4.29906 4.29906 4.29906