condition mean min max ZT0-3 10.032027062500001 9.59511372 10.468940405000001 ZT4-7 9.331101288833334 8.774611604666667 9.887590973 ZT8-11 10.140975476333335 9.820870907333333 10.461080045333334 ZT12-15 10.277689179 9.885056459 10.670321899000001 ZT16-19 11.641913599999999 11.59249711 11.69133009 ZT20-23 12.354176963333334 12.077719663333333 12.630634263333334