condition mean min max ZT0-3 16.306449999999998 14.1588 18.0083 ZT4-7 7.16649 7.16649 7.16649 ZT8-11 2.35638 2.35638 2.35638 ZT12-15 10.985235000000001 9.92359 12.046880000000002 ZT16-19 21.86345 21.86345 21.86345 ZT20-23 30.024749999999997 30.024749999999997 30.024749999999997