condition mean min max ZT0-3 0.7250813333333334 0.6104365 0.8550725 ZT4-7 0.698037 0.698037 0.698037 ZT8-11 1.54366 1.54366 1.54366 ZT12-15 1.9119475000000001 1.87019 1.953705 ZT16-19 1.4932599999999998 1.4932599999999998 1.4932599999999998 ZT20-23 1.5369549999999998 1.5369549999999998 1.5369549999999998