condition mean min max ZT0-3 1.21314125 0.8531275 1.5731549999999999 ZT4-7 0.58241 0.58241 0.58241 ZT8-11 1.0059725 1.0059725 1.0059725 ZT12-15 0 0 0 ZT16-19 0.7033845000000001 0.7033845000000001 0.7033845000000001 ZT20-23 0.7072425 0.7072425 0.7072425