condition mean min max ZT0-3 15.719850000000001 15.719850000000001 15.719850000000001 ZT4-7 15.02925 15.02925 15.02925 ZT8-11 14.933050000000001 14.933050000000001 14.933050000000001 ZT12-15 11.80845 11.80845 11.80845 ZT16-19 15.66865 15.66865 15.66865 ZT20-23 14.754999999999999 14.754999999999999 14.754999999999999