condition mean min max ZT0-3 1.9987168284999999 0.8830981999999999 3.1143354569999997 ZT4-7 2.1672732097500003 1.2174403035 3.117106116 ZT8-11 5.077881930749999 3.6946850409999996 6.461078820499999 ZT12-15 7.248220926 6.9750792495 7.5213626025 ZT16-19 5.271066178250001 4.398366795 6.1437655615 ZT20-23 8.760186582 8.315072191 9.205300973