condition mean min max ZT0-3 1.4461875 1.1922199999999998 1.700155 ZT4-7 0.7405885000000001 0.7405885000000001 0.7405885000000001 ZT8-11 2.238575 2.238575 2.238575 ZT12-15 0 0 0 ZT16-19 2.61306 2.61306 2.61306 ZT20-23 2.916015 2.916015 2.916015