condition mean min max ZT0-3 1.8105073333333332 1.8105073333333332 1.8105073333333332 ZT4-7 2.727703 2.727703 2.727703 ZT8-11 2.036 2.036 2.036 ZT12-15 1.365165 1.365165 1.365165 ZT16-19 6.499762 6.499762 6.499762 ZT20-23 2.2215730000000002 2.2215730000000002 2.2215730000000002