condition mean min max ZT0-3 0.026461966666666666 0.02520745 0.0283006 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0779001 0.0779001 0.0779001 ZT12-15 0.052679975 0.0259515 0.07940844999999999 ZT16-19 0.07359935000000001 0.07359935000000001 0.07359935000000001 ZT20-23 0.0283526 0.0283526 0.0283526