condition mean min max ZT0-3 0.266368 0.210551 0.322185 ZT4-7 0.268964 0.268964 0.268964 ZT8-11 0.06194395 0.06194395 0.06194395 ZT12-15 0 0 0 ZT16-19 0.24386249999999998 0.24386249999999998 0.24386249999999998 ZT20-23 0.32789 0.32789 0.32789