condition mean min max ZT0-3 1.41246 1.41246 1.41246 ZT4-7 1.4094609999999999 1.4094609999999999 1.4094609999999999 ZT8-11 1.128795 1.128795 1.128795 ZT12-15 1.036843 1.036843 1.036843 ZT16-19 1.033377 1.033377 1.033377 ZT20-23 1.522775 1.522775 1.522775