condition mean min max ZT0-3 0.5068518333333333 0.2848585 0.72832 ZT4-7 0.7273445000000001 0.7273445000000001 0.7273445000000001 ZT8-11 0.871006 0.871006 0.871006 ZT12-15 1.4126175 1.354385 1.47085 ZT16-19 1.520025 1.520025 1.520025 ZT20-23 0.808217 0.808217 0.808217