condition mean min max ZT0-3 3.826978333333333 2.07297 4.8919049999999995 ZT4-7 2.341455 2.341455 2.341455 ZT8-11 2.038595 2.038595 2.038595 ZT12-15 7.854640000000001 6.298825000000001 9.410455 ZT16-19 5.4783100000000005 5.4783100000000005 5.4783100000000005 ZT20-23 2.9814 2.9814 2.9814