condition mean min max ZT0-3 1.8391700000000002 1.787805 1.890535 ZT4-7 1.284295 1.284295 1.284295 ZT8-11 2.7874800000000004 2.7874800000000004 2.7874800000000004 ZT12-15 0 0 0 ZT16-19 4.573095 4.573095 4.573095 ZT20-23 3.3377749999999997 3.3377749999999997 3.3377749999999997