condition mean min max ZT0-3 0.066134 0.0 0.132268 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.5539535 0.022777 1.08513 ZT16-19 0.557215 0.0 1.11443 ZT20-23 0 0 0