condition mean min max ZT0-3 0.6969375 0.21539 1.244804 ZT4-7 0.679501 0.679501 0.679501 ZT8-11 2.766515 2.766515 2.766515 ZT12-15 4.0398000000000005 3.13742 4.9421800000000005 ZT16-19 3.10321 3.10321 3.10321 ZT20-23 1.639935 1.639935 1.639935