condition mean min max ZT0-3 5.753830000000001 5.5373850000000004 5.970275 ZT4-7 3.90647 3.90647 3.90647 ZT8-11 3.72318 3.72318 3.72318 ZT12-15 0 0 0 ZT16-19 3.738515 3.738515 3.738515 ZT20-23 5.45113 5.45113 5.45113