condition mean min max ZT0-3 6.188605000000001 5.291645 7.085565000000001 ZT4-7 3.20958 3.20958 3.20958 ZT8-11 3.296245 3.296245 3.296245 ZT12-15 0 0 0 ZT16-19 4.7057199999999995 4.7057199999999995 4.7057199999999995 ZT20-23 4.115625 4.115625 4.115625