condition mean min max ZT0-3 12.03555 12.03555 12.03555 ZT4-7 10.58219 10.58219 10.58219 ZT8-11 8.429395 8.429395 8.429395 ZT12-15 10.10966 10.10966 10.10966 ZT16-19 11.26915 11.26915 11.26915 ZT20-23 10.6369 10.6369 10.6369