condition mean min max ZT0-3 0.13722466666666666 0.083438 0.240479 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.3033515 0.3033515 0.3033515 ZT20-23 0.2637555 0.2637555 0.2637555