condition mean min max ZT0-3 0.55851960675 0.276829818 0.8402093955 ZT4-7 2.66495551725 2.188946104 3.1409649305 ZT8-11 1.9246416257499999 1.703465622 2.1458176294999998 ZT12-15 1.6455478912500001 1.421893627 1.8692021555 ZT16-19 1.111712599 1.0999734755 1.1234517225 ZT20-23 0.98893026975 0.9824093975 0.995451142