condition mean min max ZT0-3 4.50345880375 4.3228118994999996 4.684105708 ZT4-7 2.5822326285 2.4610188715 2.7034463855000004 ZT8-11 3.3416378284999997 2.9054568505 3.7778188065 ZT12-15 4.41368421725 3.5159821745000004 5.31138626 ZT16-19 4.191702401500001 3.326776044 5.0566287590000005 ZT20-23 10.53406389175 8.8511864835 12.2169413