condition mean min max ZT0-3 0.8995065652500001 0.59198112 1.2070320105 ZT4-7 4.356145601 3.5582850815000002 5.1540061205 ZT8-11 5.2450959125 4.559453537 5.930738288000001 ZT12-15 10.5481511045 7.854004404 13.242297805 ZT16-19 13.72998843 12.866879225000002 14.593097635 ZT20-23 17.027519944999998 15.881535204999999 18.173504684999997