condition mean min max ZT0-3 5.7453348142500005 5.5725449855 5.918124643 ZT4-7 4.627348035000001 3.495753693 5.758942377 ZT8-11 3.79163727075 3.1066253635 4.476649178 ZT12-15 1.8425264007500002 1.496853189 2.1881996125 ZT16-19 2.0048134515 1.959185677 2.0504412260000002 ZT20-23 3.04698554675 2.9792210335000004 3.1147500600000004