condition mean min max ZT0-3 29.455416666666665 20.88185 36.0757 ZT4-7 21.1679 21.1679 21.1679 ZT8-11 34.25725 34.25725 34.25725 ZT12-15 32.21415 28.92755 35.50075 ZT16-19 36.4727 36.4727 36.4727 ZT20-23 44.3869 44.3869 44.3869