condition mean min max ZT0-3 10.71638694925 8.168300891 13.2644730075 ZT4-7 16.4178001875 16.200064855 16.635535519999998 ZT8-11 14.95455613 12.36059402 17.54851824 ZT12-15 16.748774245 16.005358424999997 17.492190065 ZT16-19 15.391008487499999 14.975940705 15.806076269999998 ZT20-23 15.468292957500001 15.44119457 15.495391345000002