condition mean min max ZT0-3 376.625947 376.625947 376.625947 ZT4-7 355.68554099999994 355.68554099999994 355.68554099999994 ZT8-11 398.92830749999996 398.92830749999996 398.92830749999996 ZT12-15 377.837113 377.837113 377.837113 ZT16-19 647.417588 647.417588 647.417588 ZT20-23 681.8617735 681.8617735 681.8617735