condition mean min max ZT0-3 50.32111111 50.32111111 50.32111111 ZT4-7 40.82888889 40.82888889 40.82888889 ZT8-11 57.415555553333334 57.415555553333334 57.415555553333334 ZT12-15 79.03999999 79.03999999 79.03999999 ZT16-19 68.08111111 68.08111111 68.08111111 ZT20-23 60.27444444333334 60.27444444333334 60.27444444333334