condition mean min max ZT0-3 424.179328 424.179328 424.179328 ZT4-7 352.9706695 352.9706695 352.9706695 ZT8-11 401.34101599999997 401.34101599999997 401.34101599999997 ZT12-15 417.59529299999997 417.59529299999997 417.59529299999997 ZT16-19 434.9710285 434.9710285 434.9710285 ZT20-23 451.66801350000003 451.66801350000003 451.66801350000003