condition mean min max ZT0-3 1.36978105075 0.8334492235 1.906112878 ZT4-7 0.4264171025 0.295728567 0.557105638 ZT8-11 6.8481277585 2.779212459 10.917043058 ZT12-15 13.647075051249999 12.0783705325 15.215779569999999 ZT16-19 10.94591024875 10.424757272499999 11.467063225 ZT20-23 23.3746360425 13.652961565 33.09631052