condition mean min max ZT0-3 0.3969275 0.0 0.793855 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.113977 0.0 0.227954 ZT20-23 0 0 0