condition mean min max ZT0-3 54.75265591416667 53.275720725 56.229591103333334 ZT4-7 78.39633552333333 69.73970725333334 87.05296379333333 ZT8-11 75.898891465 67.05820298 84.73957995 ZT12-15 50.69061354 50.12334213 51.257884950000005 ZT16-19 72.67630703166667 68.44068512333334 76.91192894 ZT20-23 66.15836401833334 63.715456923333335 68.60127111333334