condition mean min max ZT0-3 0.04870475 0.0 0.0974095 ZT4-7 0.0983115 0.0983115 0.0983115 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0