condition mean min max ZT0-3 0.5607317675 0.418887225 0.70257631 ZT4-7 1.52350544825 1.3061839235 1.7408269729999999 ZT8-11 9.439288419750001 2.5678709260000003 16.3107059135 ZT12-15 35.40919885 31.158977175 39.659420525 ZT16-19 22.801750515000002 20.85400548 24.74949555 ZT20-23 17.5454613675 16.262094175 18.828828559999998