condition mean min max ZT0-3 1.0450725 1.0450725 1.0450725 ZT4-7 0.559672 0.559672 0.559672 ZT8-11 0.6376105 0.6376105 0.6376105 ZT12-15 1.1643035 1.1643035 1.1643035 ZT16-19 2.4161200000000003 2.4161200000000003 2.4161200000000003 ZT20-23 1.331215 1.331215 1.331215