condition mean min max ZT0-3 0.958754 0.958754 0.958754 ZT4-7 0.7228205 0.7228205 0.7228205 ZT8-11 1.0299334999999998 1.0299334999999998 1.0299334999999998 ZT12-15 0.5942700000000001 0.5942700000000001 0.5942700000000001 ZT16-19 0.841739 0.841739 0.841739 ZT20-23 1.0716916666666667 1.0716916666666667 1.0716916666666667