condition mean min max ZT0-3 1.801985 1.801985 1.801985 ZT4-7 0.43215400000000004 0.43215400000000004 0.43215400000000004 ZT8-11 1.36715 1.36715 1.36715 ZT12-15 2.802675 2.802675 2.802675 ZT16-19 5.14837 5.14837 5.14837 ZT20-23 2.400945 2.400945 2.400945