condition mean min max ZT0-3 3.9160896666666667 0.914694 6.0529150000000005 ZT4-7 2.532175 2.532175 2.532175 ZT8-11 1.180245 1.180245 1.180245 ZT12-15 5.7229955 2.07737 9.368621 ZT16-19 2.016325 2.016325 2.016325 ZT20-23 2.732845 2.732845 2.732845