condition mean min max ZT0-3 17.799097500000002 14.521595000000001 21.0766 ZT4-7 3.063675 3.063675 3.063675 ZT8-11 1.532625 1.532625 1.532625 ZT12-15 0 0 0 ZT16-19 3.434585 3.434585 3.434585 ZT20-23 2.729785 2.729785 2.729785