condition mean min max ZT0-3 8.44526 8.178619999999999 8.7119 ZT4-7 10.0307 10.0307 10.0307 ZT8-11 4.30439 4.30439 4.30439 ZT12-15 0 0 0 ZT16-19 4.38968 4.38968 4.38968 ZT20-23 9.40029 9.40029 9.40029