condition mean min max ZT0-3 2.14641712125 1.779038686 2.5137955565 ZT4-7 3.288641419 2.868466151 3.708816687 ZT8-11 3.044284394 2.9286212575 3.1599475305 ZT12-15 3.9912120559999997 2.834694357 5.147729754999999 ZT16-19 7.092686487749999 6.375996731499999 7.809376244 ZT20-23 8.41569437625 8.0328531215 8.798535631