condition mean min max ZT0-3 0.017917616666666667 0.0 0.0275145 ZT4-7 0.0250533 0.0250533 0.0250533 ZT8-11 0.05269035 0.05269035 0.05269035 ZT12-15 0.0420097 0.0 0.0840194 ZT16-19 0.050059400000000004 0.050059400000000004 0.050059400000000004 ZT20-23 0.056470450000000005 0.056470450000000005 0.056470450000000005