condition mean min max ZT0-3 3.07639726925 3.0432875085000006 3.10950703 ZT4-7 2.688610112 2.2317297115 3.1454905125 ZT8-11 3.0940380672499996 2.8680671445 3.32000899 ZT12-15 3.0844432965 2.642220831 3.5266657620000004 ZT16-19 3.27954881875 2.5247837134999997 4.034313924 ZT20-23 7.275851592 6.455877731 8.095825453