condition mean min max ZT0-3 0.958503 0.958503 0.958503 ZT4-7 1.0701800000000001 1.0701800000000001 1.0701800000000001 ZT8-11 1.72387 1.72387 1.72387 ZT12-15 1.622215 1.622215 1.622215 ZT16-19 2.252635 2.252635 2.252635 ZT20-23 0.9881675 0.9881675 0.9881675