condition mean min max ZT0-3 503.554886 503.554886 503.554886 ZT4-7 462.2357515 462.2357515 462.2357515 ZT8-11 402.0945305 402.0945305 402.0945305 ZT12-15 441.283702 441.283702 441.283702 ZT16-19 540.8054395 540.8054395 540.8054395 ZT20-23 569.5498749999999 569.5498749999999 569.5498749999999