condition mean min max ZT0-3 0.0374901 0.0370521 0.0379281 ZT4-7 0.0 0.0 0.0 ZT8-11 0.15334955 0.15334955 0.15334955 ZT12-15 0 0 0 ZT16-19 0.0372502 0.0372502 0.0372502 ZT20-23 0.03766925 0.03766925 0.03766925