condition mean min max ZT0-3 5.2776321505 3.6018186219999997 6.953445679 ZT4-7 9.35548646075 7.111009983000001 11.5999629385 ZT8-11 14.277569615 12.89537422 15.65976501 ZT12-15 10.117919846 8.4743385345 11.7615011575 ZT16-19 9.305166933 8.392759804 10.217574062 ZT20-23 11.726743431000001 11.672742837000001 11.780744025