condition mean min max ZT0-3 6.5075258875 6.148473434 6.866578341 ZT4-7 4.65636658425 4.634429213 4.6783039555000006 ZT8-11 4.850666454 4.1790478454999995 5.5222850625 ZT12-15 6.4190334325 6.013413863 6.824653002 ZT16-19 8.127537019 7.474611756000001 8.780462281999998 ZT20-23 6.67368543175 6.1801730265 7.167197837