condition mean min max ZT0-3 1.5642 1.5642 1.5642 ZT4-7 0.9766465 0.9766465 0.9766465 ZT8-11 2.44398 2.44398 2.44398 ZT12-15 2.521739 2.521739 2.521739 ZT16-19 2.246695 2.246695 2.246695 ZT20-23 0.9799115 0.9799115 0.9799115