condition mean min max ZT0-3 1.9167375 1.894345 1.93913 ZT4-7 11.53523 11.53523 11.53523 ZT8-11 3.8923949999999996 3.8923949999999996 3.8923949999999996 ZT12-15 0 0 0 ZT16-19 5.7134 5.7134 5.7134 ZT20-23 1.909805 1.909805 1.909805