condition mean min max ZT0-3 0.0 0.0 0.0 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 0.013584126666666667 0.0 0.027168253333333333 ZT20-23 0.0300184285 0.01850263 0.041534227