condition mean min max ZT0-3 0.0404889 0.0404889 0.0404889 ZT4-7 0.0134563 0.0134563 0.0134563 ZT8-11 0.0582105 0.0582105 0.0582105 ZT12-15 0.03097705 0.03097705 0.03097705 ZT16-19 0.02327615 0.02327615 0.02327615 ZT20-23 0.0232259 0.0232259 0.0232259