condition mean min max ZT0-3 6.06659706675 5.41477331 6.7184208235 ZT4-7 2.7148079024999996 2.4204912074999996 3.0091245975 ZT8-11 11.516203304 7.153334807999999 15.879071799999998 ZT12-15 27.99985843 19.564999195 36.434717665 ZT16-19 21.72028754 19.59578937 23.844785710000004 ZT20-23 39.2167951125 35.372047025 43.0615432