condition mean min max ZT0-3 0.0339277535 0.0 0.067855507 ZT4-7 0.81646232925 0.493585886 1.1393387725 ZT8-11 8.63431663525 6.0829560645 11.185677206000001 ZT12-15 7.589644364 3.770287362 11.409001366 ZT16-19 0.2950887065 0.16643506500000002 0.423742348 ZT20-23 0.074610499 0.064965755 0.08425524300000001