condition mean min max ZT0-3 27.650521 27.650521 27.650521 ZT4-7 40.4392455 40.4392455 40.4392455 ZT8-11 45.9310855 45.9310855 45.9310855 ZT12-15 37.774176 37.774176 37.774176 ZT16-19 28.139608 28.139608 28.139608 ZT20-23 22.9063415 22.9063415 22.9063415