condition mean min max ZT0-3 0.8761225 0.841427 0.910818 ZT4-7 1.08183 1.08183 1.08183 ZT8-11 1.3248250000000001 1.3248250000000001 1.3248250000000001 ZT12-15 0 0 0 ZT16-19 1.97511 1.97511 1.97511 ZT20-23 2.13879 2.13879 2.13879