condition mean min max ZT0-3 1.0661573333333334 0.9097755 1.1815815 ZT4-7 1.740275 1.740275 1.740275 ZT8-11 1.67739 1.67739 1.67739 ZT12-15 3.9560825000000004 3.2861900000000004 4.625975 ZT16-19 1.887585 1.887585 1.887585 ZT20-23 1.0434240000000001 1.0434240000000001 1.0434240000000001