condition mean min max ZT0-3 0.520246 0.4929795 0.5475125 ZT4-7 0.9561504999999999 0.9561504999999999 0.9561504999999999 ZT8-11 3.024405 3.024405 3.024405 ZT12-15 0 0 0 ZT16-19 2.1092750000000002 2.1092750000000002 2.1092750000000002 ZT20-23 1.173317 1.173317 1.173317