condition mean min max ZT0-3 0.04538475 0.0 0.0907695 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.04463355 0.04463355 0.04463355 ZT20-23 0.0 0.0 0.0