condition mean min max ZT0-3 1.4683024999999998 1.4683024999999998 1.4683024999999998 ZT4-7 0.9127609999999999 0.9127609999999999 0.9127609999999999 ZT8-11 0.460415 0.460415 0.460415 ZT12-15 0.416389 0.416389 0.416389 ZT16-19 1.97146 1.97146 1.97146 ZT20-23 1.42929 1.42929 1.42929