condition mean min max ZT0-3 223.884983 223.884983 223.884983 ZT4-7 204.947612 204.947612 204.947612 ZT8-11 218.2219865 218.2219865 218.2219865 ZT12-15 275.145306 275.145306 275.145306 ZT16-19 294.49098100000003 294.49098100000003 294.49098100000003 ZT20-23 379.84256949999997 379.84256949999997 379.84256949999997