condition mean min max ZT0-3 8.0714397365 7.90546219 8.237417283 ZT4-7 5.89242371425 4.8420044765000005 6.9428429519999995 ZT8-11 10.183647885 8.111141374999999 12.256154395 ZT12-15 14.32808094175 11.1013774635 17.55478442 ZT16-19 10.0140240175 9.209938820000001 10.818109215 ZT20-23 13.97652961 13.224535815 14.728523405