condition mean min max ZT0-3 138.368625 138.368625 138.368625 ZT4-7 77.996204 77.996204 77.996204 ZT8-11 110.935118 110.935118 110.935118 ZT12-15 147.3474395 147.3474395 147.3474395 ZT16-19 179.59225149999997 179.59225149999997 179.59225149999997 ZT20-23 176.6704345 176.6704345 176.6704345