condition mean min max ZT0-3 0.156529788 0.0 0.313059576 ZT4-7 1.86998748325 1.7681171125000001 1.971857854 ZT8-11 3.7142552909999997 3.4421188254999997 3.9863917564999998 ZT12-15 6.04911215475 5.4209394005 6.677284909 ZT16-19 3.4729667785 3.1369465275 3.8089870295 ZT20-23 2.076701064 1.6289515035000002 2.5244506245