condition mean min max ZT0-3 5.9669075 5.671285 6.26253 ZT4-7 6.499359999999999 6.499359999999999 6.499359999999999 ZT8-11 4.5488 4.5488 4.5488 ZT12-15 0 0 0 ZT16-19 6.38228 6.38228 6.38228 ZT20-23 5.562215 5.562215 5.562215