condition mean min max ZT0-3 0.047757966666666665 0.0 0.09551593333333333 ZT4-7 0.0 0.0 0.0 ZT8-11 0.021885199999999997 0.021885199999999997 0.021885199999999997 ZT12-15 0.013869600000000001 0.0 0.027739200000000002 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0