condition mean min max ZT0-3 366.178651 366.178651 366.178651 ZT4-7 540.5707749999999 540.5707749999999 540.5707749999999 ZT8-11 532.423964 532.423964 532.423964 ZT12-15 380.446931 380.446931 380.446931 ZT16-19 357.7949345 357.7949345 357.7949345 ZT20-23 288.4550365 288.4550365 288.4550365