condition mean min max ZT0-3 1.22018323525 0.654793351 1.7855731195 ZT4-7 2.62644314875 2.1810157114999997 3.071870586 ZT8-11 5.5713650465 4.1008196505 7.041910442500001 ZT12-15 6.3328137215 5.9965557265000005 6.6690717164999995 ZT16-19 5.142335280499999 4.7494801419999995 5.535190419 ZT20-23 8.54208657775 7.078054421499999 10.006118734000001