condition mean min max ZT0-3 2.3849675 1.93119 2.8387450000000003 ZT4-7 2.392135 2.392135 2.392135 ZT8-11 3.3796 3.3796 3.3796 ZT12-15 0 0 0 ZT16-19 3.81682 3.81682 3.81682 ZT20-23 2.011435 2.011435 2.011435