condition mean min max ZT0-3 3.322743925 2.016356576 4.629131274 ZT4-7 1.83081490575 1.04259467 2.6190351415 ZT8-11 3.6410388767499997 3.0296032179999997 4.252474535499999 ZT12-15 4.70354807075 4.3121454325 5.094950709 ZT16-19 3.4344859305 3.2342677115000003 3.6347041495 ZT20-23 4.526195456 4.350328254500001 4.7020626575