condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.117584962 0.0 0.235169924 ZT12-15 0.047241531999999996 0.0 0.09448306399999999 ZT16-19 0.0 0.0 0.0 ZT20-23 0.024639231166666664 0.0 0.04927846233333333