condition mean min max ZT0-3 171.847441 171.847441 171.847441 ZT4-7 91.994187 91.994187 91.994187 ZT8-11 117.6321545 117.6321545 117.6321545 ZT12-15 147.724954 147.724954 147.724954 ZT16-19 236.952573 236.952573 236.952573 ZT20-23 270.40002300000003 270.40002300000003 270.40002300000003