condition mean min max ZT0-3 5.506405 5.506405 5.506405 ZT4-7 3.2744400000000002 3.2744400000000002 3.2744400000000002 ZT8-11 5.101895000000001 5.101895000000001 5.101895000000001 ZT12-15 4.727875 4.727875 4.727875 ZT16-19 10.00308 10.00308 10.00308 ZT20-23 5.83747 5.83747 5.83747