condition mean min max ZT0-3 1883.288331 1883.288331 1883.288331 ZT4-7 1998.0686289999999 1998.0686289999999 1998.0686289999999 ZT8-11 2255.5995395 2255.5995395 2255.5995395 ZT12-15 2347.3050885000002 2347.3050885000002 2347.3050885000002 ZT16-19 2396.2709655 2396.2709655 2396.2709655 ZT20-23 1837.1345529999999 1837.1345529999999 1837.1345529999999