condition mean min max ZT0-3 0.785076605 0.688556712 0.881596498 ZT4-7 1.789135816 0.9611349105 2.6171367214999997 ZT8-11 3.6057152622500004 3.4421432260000002 3.7692872985 ZT12-15 2.9786363817500003 2.9758114355000003 2.981461328 ZT16-19 2.71444906125 2.319981189 3.1089169334999998 ZT20-23 4.3008404185 3.6689350305 4.9327458065