condition mean min max ZT0-3 2.2928025 2.175465 2.41014 ZT4-7 4.97546 4.97546 4.97546 ZT8-11 11.019200000000001 11.019200000000001 11.019200000000001 ZT12-15 0 0 0 ZT16-19 5.875885 5.875885 5.875885 ZT20-23 4.220715 4.220715 4.220715