condition mean min max ZT0-3 1.681938 0.9692890000000001 2.89641 ZT4-7 1.435145 1.435145 1.435145 ZT8-11 1.0426805 1.0426805 1.0426805 ZT12-15 0.7628282499999999 0.31893649999999996 1.2067199999999998 ZT16-19 0.6215345 0.6215345 0.6215345 ZT20-23 1.021144 1.021144 1.021144