condition mean min max ZT0-3 0.8797785 0.497977 1.26158 ZT4-7 1.8805749999999999 1.8805749999999999 1.8805749999999999 ZT8-11 0.504172 0.504172 0.504172 ZT12-15 0 0 0 ZT16-19 0.557752 0.557752 0.557752 ZT20-23 1.6851450000000001 1.6851450000000001 1.6851450000000001