condition mean min max ZT0-3 1.2619785000000001 1.110862 1.413095 ZT4-7 0.49642200000000003 0.49642200000000003 0.49642200000000003 ZT8-11 0.141673 0.141673 0.141673 ZT12-15 0 0 0 ZT16-19 0.9731859999999999 0.9731859999999999 0.9731859999999999 ZT20-23 1.0616975 1.0616975 1.0616975