condition mean min max ZT0-3 169.060929 169.060929 169.060929 ZT4-7 218.7088965 218.7088965 218.7088965 ZT8-11 191.88105000000002 191.88105000000002 191.88105000000002 ZT12-15 181.344347 181.344347 181.344347 ZT16-19 135.9188995 135.9188995 135.9188995 ZT20-23 103.7254655 103.7254655 103.7254655