condition mean min max ZT0-3 0.10830331125 0.0 0.2166066225 ZT4-7 1.46709902825 0.75621486 2.1779831965 ZT8-11 3.1489859245 2.9823838620000003 3.315587987 ZT12-15 6.311270358 6.02656801 6.5959727059999995 ZT16-19 12.7466797135 10.482033762 15.011325665 ZT20-23 25.6172668775 23.61819562 27.616338135