condition mean min max ZT0-3 8.833207499999999 8.019504999999999 9.646909999999998 ZT4-7 6.635149999999999 6.635149999999999 6.635149999999999 ZT8-11 6.287305 6.287305 6.287305 ZT12-15 0 0 0 ZT16-19 11.4632 11.4632 11.4632 ZT20-23 9.569534999999998 9.569534999999998 9.569534999999998