condition mean min max ZT0-3 1.0343005 0.9632425 1.1053585 ZT4-7 1.174116 1.174116 1.174116 ZT8-11 1.1741424999999999 1.1741424999999999 1.1741424999999999 ZT12-15 0 0 0 ZT16-19 1.3044250000000002 1.3044250000000002 1.3044250000000002 ZT20-23 1.1225565 1.1225565 1.1225565