condition mean min max ZT0-3 2.11002332225 1.579432142 2.6406145025 ZT4-7 3.6198823727500002 2.9362674235000004 4.303497322 ZT8-11 4.740446755500001 4.034264633 5.446628878 ZT12-15 5.53118843225 4.4433890405 6.6189878239999995 ZT16-19 3.7525080285 3.1758066025 4.3292094545 ZT20-23 8.70431744825 6.50489792 10.9037369765