condition mean min max ZT0-3 0.01353025 0.0 0.0270605 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0062225125 0.0 0.012445025 ZT16-19 0.014942566666666665 0.0 0.02988513333333333 ZT20-23 0 0 0