condition mean min max ZT0-3 8.326572500000001 7.979475000000001 8.673670000000001 ZT4-7 7.597524999999999 7.597524999999999 7.597524999999999 ZT8-11 8.104804999999999 8.104804999999999 8.104804999999999 ZT12-15 0 0 0 ZT16-19 9.09976 9.09976 9.09976 ZT20-23 9.567184999999998 9.567184999999998 9.567184999999998