condition mean min max ZT0-3 0.0463955 0.0 0.069888 ZT4-7 0.0636365 0.0636365 0.0636365 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0647565 0.0647565 0.0647565 ZT20-23 0.0 0.0 0.0