condition mean min max ZT0-3 0.8626171666666667 0.796511 0.919516 ZT4-7 0.7816145 0.7816145 0.7816145 ZT8-11 1.16859 1.16859 1.16859 ZT12-15 3.457615 3.3759300000000003 3.5393 ZT16-19 1.91939 1.91939 1.91939 ZT20-23 1.5959349999999999 1.5959349999999999 1.5959349999999999