condition mean min max ZT0-3 0.21276899999999999 0.199984 0.2341035 ZT4-7 0.257013 0.257013 0.257013 ZT8-11 0.13198759999999998 0.13198759999999998 0.13198759999999998 ZT12-15 1.0100445 0.6100289999999999 1.41006 ZT16-19 0.6880115 0.6880115 0.6880115 ZT20-23 0.8032305 0.8032305 0.8032305