condition mean min max ZT0-3 0.8311935 0.789406 0.872981 ZT4-7 0.41885700000000003 0.41885700000000003 0.41885700000000003 ZT8-11 2.09575 2.09575 2.09575 ZT12-15 0 0 0 ZT16-19 1.5072 1.5072 1.5072 ZT20-23 0.8409795 0.8409795 0.8409795