condition mean min max ZT0-3 3.68952774675 0.725101965 6.6539535285 ZT4-7 27.9800010625 24.24599769 31.714004435 ZT8-11 64.0638665075 54.48915078 73.638582235 ZT12-15 79.989273735 69.19965943 90.77888804 ZT16-19 48.36057991 42.99557595 53.72558387 ZT20-23 33.8682864575 32.71517119 35.021401725