condition mean min max ZT0-3 0.902053 0.534911 1.2691949999999999 ZT4-7 0.5418595 0.5418595 0.5418595 ZT8-11 1.0961885 1.0961885 1.0961885 ZT12-15 0 0 0 ZT16-19 1.4270049999999999 1.4270049999999999 1.4270049999999999 ZT20-23 0.5368065 0.5368065 0.5368065