condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.04208375 0.0 0.0841675 ZT16-19 0.083592 0.083592 0.083592 ZT20-23 0.0 0.0 0.0