condition mean min max ZT0-3 8.46249336 7.890608188 9.034378532 ZT4-7 7.9052320389999995 7.100592818499999 8.7098712595 ZT8-11 12.5217535125 11.5762467905 13.4672602345 ZT12-15 16.0743024175 14.729702674999999 17.418902160000002 ZT16-19 15.3447240725 14.315260045 16.374188099999998 ZT20-23 10.071112014250001 9.515662171 10.6265618575