condition mean min max ZT0-3 0.3356096666666667 0.2612185 0.479991 ZT4-7 0.2495935 0.2495935 0.2495935 ZT8-11 0.579573 0.579573 0.579573 ZT12-15 0.9043662499999999 0.7630115 1.045721 ZT16-19 0.7800039999999999 0.7800039999999999 0.7800039999999999 ZT20-23 1.0840385 1.0840385 1.0840385