condition mean min max ZT0-3 1.3101148333333332 1.0284895 1.5466199999999999 ZT4-7 0.8294945 0.8294945 0.8294945 ZT8-11 2.0833 2.0833 2.0833 ZT12-15 3.9699349999999995 3.44934 4.49053 ZT16-19 2.786805 2.786805 2.786805 ZT20-23 2.803815 2.803815 2.803815