condition mean min max ZT0-3 65.62755 65.62755 65.62755 ZT4-7 36.0173025 36.0173025 36.0173025 ZT8-11 30.273162999999997 30.273162999999997 30.273162999999997 ZT12-15 36.5670425 36.5670425 36.5670425 ZT16-19 27.410342 27.410342 27.410342 ZT20-23 29.3614885 29.3614885 29.3614885