condition mean min max ZT0-3 7.2165226735 6.681762078999999 7.751283268 ZT4-7 8.00634645575 7.2501408309999995 8.7625520805 ZT8-11 9.64063005125 8.873049250000001 10.4082108525 ZT12-15 7.45352052875 7.1462775665 7.7607634910000005 ZT16-19 8.388223149249999 7.1588968855 9.617549412999999 ZT20-23 12.916851255 11.81800324 14.015699269999999