condition mean min max ZT0-3 1.5453563333333333 1.0947689999999999 2.052835 ZT4-7 1.91038 1.91038 1.91038 ZT8-11 0.8905445 0.8905445 0.8905445 ZT12-15 1.04841075 0.7934665000000001 1.303355 ZT16-19 0.8307475 0.8307475 0.8307475 ZT20-23 1.105868 1.105868 1.105868