condition mean min max ZT0-3 0.0224868555 0.0 0.044973711 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 0.0 0.0 0.0 ZT20-23 0.019152226166666668 0.0 0.038304452333333336