condition mean min max ZT0-3 5.88205433575 5.2206749915 6.54343368 ZT4-7 2.593067393 1.984157352 3.201977434 ZT8-11 2.4392759820000003 1.6142680125 3.2642839515000004 ZT12-15 3.59891897525 3.4406455940000003 3.7571923565 ZT16-19 3.8693901005 3.0915427565 4.6472374445 ZT20-23 6.2289579777499995 5.7071600595 6.750755896