condition mean min max ZT0-3 423.14183679999996 406.5743007 439.70937289999995 ZT4-7 196.3788381 162.46097435 230.29670185 ZT8-11 219.60905005 180.8656537 258.3524464 ZT12-15 165.1092279525 141.84875614999999 188.369699755 ZT16-19 162.6216765 160.70404635 164.53930665000001 ZT20-23 136.74124617500001 118.93635599999999 154.54613635