condition mean min max ZT0-3 9.90859623275 6.9314235355000005 12.88576893 ZT4-7 14.725685625 7.634034380000001 21.81733687 ZT8-11 35.3897016575 31.336030665000003 39.44337265 ZT12-15 42.905807875 38.77192262 47.03969313 ZT16-19 21.91804136 20.06808195 23.76800077 ZT20-23 17.18606803 16.687216685 17.684919375