condition mean min max ZT0-3 5.756584999999999 5.756584999999999 5.756584999999999 ZT4-7 4.514135 4.514135 4.514135 ZT8-11 6.5973749999999995 6.5973749999999995 6.5973749999999995 ZT12-15 5.938295 5.938295 5.938295 ZT16-19 8.429435 8.429435 8.429435 ZT20-23 6.27192 6.27192 6.27192