condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0336443005 0.0 0.067288601 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.021976210333333333 0.0 0.043952420666666665