condition mean min max ZT0-3 1.4757616960000002 1.43259431 1.518929082 ZT4-7 2.97788741075 2.0014514185 3.954323403 ZT8-11 5.25604653875 4.453693233999999 6.0583998435 ZT12-15 8.6059944265 6.883632374499999 10.3283564785 ZT16-19 9.259999842500001 8.950386857000002 9.569612828 ZT20-23 12.41990607825 10.9686016815 13.871210475