condition mean min max ZT0-3 31.679583 31.679583 31.679583 ZT4-7 37.183591 37.183591 37.183591 ZT8-11 39.188108 39.188108 39.188108 ZT12-15 38.584907 38.584907 38.584907 ZT16-19 42.795683999999994 42.795683999999994 42.795683999999994 ZT20-23 43.787717 43.787717 43.787717