condition mean min max ZT0-3 0.8148735 0.682272 0.9379255 ZT4-7 0.960119 0.960119 0.960119 ZT8-11 1.5869650000000002 1.5869650000000002 1.5869650000000002 ZT12-15 1.807835 1.7154850000000001 1.900185 ZT16-19 1.4878550000000001 1.4878550000000001 1.4878550000000001 ZT20-23 0.863175 0.863175 0.863175