condition mean min max ZT0-3 33.902245 33.902245 33.902245 ZT4-7 19.257067 19.257067 19.257067 ZT8-11 21.0902575 21.0902575 21.0902575 ZT12-15 28.052231 28.052231 28.052231 ZT16-19 29.920576500000003 29.920576500000003 29.920576500000003 ZT20-23 39.1552675 39.1552675 39.1552675