condition mean min max ZT0-3 1225.686143575 650.3467881500001 1801.0254989999999 ZT4-7 447.78082317499997 430.96037994999995 464.6012664 ZT8-11 367.11710392500004 363.07967025000005 371.1545376 ZT12-15 365.53481049999994 319.45873604999997 411.61088494999996 ZT16-19 295.77884205 270.3092274 321.24845669999996 ZT20-23 379.96105602499995 332.1572283 427.76488374999997