condition mean min max ZT0-3 0.416776 0.416776 0.416776 ZT4-7 0.707325 0.707325 0.707325 ZT8-11 0.35470650000000004 0.35470650000000004 0.35470650000000004 ZT12-15 0.266815 0.266815 0.266815 ZT16-19 0.8943265 0.8943265 0.8943265 ZT20-23 0.47144300000000006 0.47144300000000006 0.47144300000000006