condition mean min max ZT0-3 1.8995 1.8332549999999999 1.965745 ZT4-7 2.289985 2.289985 2.289985 ZT8-11 2.7326300000000003 2.7326300000000003 2.7326300000000003 ZT12-15 0 0 0 ZT16-19 1.6345049999999999 1.6345049999999999 1.6345049999999999 ZT20-23 1.757975 1.757975 1.757975