condition mean min max ZT0-3 4.6169899999999995 4.6169899999999995 4.6169899999999995 ZT4-7 6.01191 6.01191 6.01191 ZT8-11 4.528285 4.528285 4.528285 ZT12-15 4.405415 4.405415 4.405415 ZT16-19 5.395515 5.395515 5.395515 ZT20-23 2.81987 2.81987 2.81987