condition mean min max ZT0-3 468.393076 468.393076 468.393076 ZT4-7 585.2859975 585.2859975 585.2859975 ZT8-11 599.145291 599.145291 599.145291 ZT12-15 565.1142315 565.1142315 565.1142315 ZT16-19 470.8553515 470.8553515 470.8553515 ZT20-23 656.5949805 656.5949805 656.5949805