condition mean min max ZT0-3 6.2076775 5.326645 7.08871 ZT4-7 9.802575000000001 9.802575000000001 9.802575000000001 ZT8-11 7.4212050000000005 7.4212050000000005 7.4212050000000005 ZT12-15 0 0 0 ZT16-19 5.990925000000001 5.990925000000001 5.990925000000001 ZT20-23 7.49921 7.49921 7.49921