condition mean min max ZT0-3 0.5241125 0.353534 0.7407064999999999 ZT4-7 0.8384945 0.8384945 0.8384945 ZT8-11 1.8602850000000002 1.8602850000000002 1.8602850000000002 ZT12-15 3.3701425 2.91636 3.823925 ZT16-19 1.727595 1.727595 1.727595 ZT20-23 1.022506 1.022506 1.022506