condition mean min max ZT0-3 6.277817499999999 6.255355 6.30028 ZT4-7 7.615165 7.615165 7.615165 ZT8-11 12.50965 12.50965 12.50965 ZT12-15 0 0 0 ZT16-19 5.867255 5.867255 5.867255 ZT20-23 4.466184999999999 4.466184999999999 4.466184999999999