condition mean min max ZT0-3 0.28597316666666667 0.2344645 0.381417 ZT4-7 0.076341 0.076341 0.076341 ZT8-11 0.2344215 0.2344215 0.2344215 ZT12-15 0.47920324999999997 0.245549 0.7128574999999999 ZT16-19 0.44693499999999997 0.44693499999999997 0.44693499999999997 ZT20-23 0.375293 0.375293 0.375293