condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0467313 0.0467313 0.0467313 ZT8-11 0.236947 0.236947 0.236947 ZT12-15 0.023096125 0.0 0.04619225 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0