condition mean min max ZT0-3 5.3873679325 4.943493899000001 5.831241966 ZT4-7 6.13255579275 4.671740892 7.5933706935 ZT8-11 7.7668720350000005 6.8030575015000005 8.730686568500001 ZT12-15 7.510771897 7.130860638 7.890683156 ZT16-19 5.6552448 4.9254575595 6.3850320405000005 ZT20-23 10.44785436875 8.9095568625 11.986151875000001