condition mean min max ZT0-3 0.0145096 0.0145096 0.0145096 ZT4-7 0.0249342 0.0249342 0.0249342 ZT8-11 0.0216923 0.0216923 0.0216923 ZT12-15 0.027093199999999998 0.027093199999999998 0.027093199999999998 ZT16-19 0.04707745 0.04707745 0.04707745 ZT20-23 0.013519100000000001 0.013519100000000001 0.013519100000000001