condition mean min max ZT0-3 28.673983333333336 16.5439 37.036950000000004 ZT4-7 14.500250000000001 14.500250000000001 14.500250000000001 ZT8-11 13.7492 13.7492 13.7492 ZT12-15 16.22005 15.28285 17.15725 ZT16-19 20.77685 20.77685 20.77685 ZT20-23 32.960899999999995 32.960899999999995 32.960899999999995