condition mean min max ZT0-3 1.3721815362499998 1.290625505 1.4537375675 ZT4-7 2.0355182637500002 1.3652428935 2.705793634 ZT8-11 9.8557035035 5.151297832999999 14.560109173999999 ZT12-15 23.50737422 23.39031309 23.62443535 ZT16-19 24.6695147525 24.122935339999998 25.216094165 ZT20-23 14.1077047105 11.625829656 16.589579765