condition mean min max ZT0-3 26.226168 26.226168 26.226168 ZT4-7 49.023096499999994 49.023096499999994 49.023096499999994 ZT8-11 59.8549555 59.8549555 59.8549555 ZT12-15 43.8788565 43.8788565 43.8788565 ZT16-19 33.645186 33.645186 33.645186 ZT20-23 20.1314585 20.1314585 20.1314585