condition mean min max ZT0-3 5.42821 5.42821 5.42821 ZT4-7 2.970835 2.970835 2.970835 ZT8-11 1.4804 1.4804 1.4804 ZT12-15 1.0923850000000002 1.0923850000000002 1.0923850000000002 ZT16-19 1.279395 1.279395 1.279395 ZT20-23 6.121040000000001 6.121040000000001 6.121040000000001