condition mean min max ZT0-3 1.50928 1.50928 1.50928 ZT4-7 1.0339915 1.0339915 1.0339915 ZT8-11 2.2961600000000004 2.2961600000000004 2.2961600000000004 ZT12-15 1.8960700000000001 1.8960700000000001 1.8960700000000001 ZT16-19 1.395085 1.395085 1.395085 ZT20-23 1.291925 1.291925 1.291925