condition mean min max ZT0-3 4.594474712 3.1475019069999997 6.041447517000001 ZT4-7 2.2310991045 2.203750566 2.2584476430000002 ZT8-11 2.6295471755 2.0125725814999997 3.2465217695 ZT12-15 3.15907793325 3.135724585 3.1824312814999995 ZT16-19 3.5741247612500002 2.6026721845 4.545577338 ZT20-23 5.338202051250001 4.52669527 6.1497088325