condition mean min max ZT0-3 1.2284718333333333 0.7745605 1.81358 ZT4-7 1.1042969999999999 1.1042969999999999 1.1042969999999999 ZT8-11 0.6666810000000001 0.6666810000000001 0.6666810000000001 ZT12-15 1.1304699999999999 0.886595 1.374345 ZT16-19 1.27118 1.27118 1.27118 ZT20-23 1.4227750000000001 1.4227750000000001 1.4227750000000001