condition mean min max ZT0-3 19.60735 19.60735 19.60735 ZT4-7 7.219810000000001 7.219810000000001 7.219810000000001 ZT8-11 10.95075 10.95075 10.95075 ZT12-15 20.2119 20.2119 20.2119 ZT16-19 31.522599999999997 31.522599999999997 31.522599999999997 ZT20-23 26.03665 26.03665 26.03665