condition mean min max ZT0-3 5.331801437999999 5.098200392 5.565402484 ZT4-7 3.572490671 3.3929627890000003 3.752018553 ZT8-11 3.7894899014999996 3.6727767119999997 3.906203091 ZT12-15 2.2171551997499996 1.7266599489999996 2.7076504505 ZT16-19 2.1898462755 2.042598279 2.337094272 ZT20-23 3.4086835552500006 2.6378050030000004 4.179562107500001