condition mean min max ZT0-3 4.5596499999999995 4.5596499999999995 4.5596499999999995 ZT4-7 4.80747 4.80747 4.80747 ZT8-11 3.8957800000000002 3.8957800000000002 3.8957800000000002 ZT12-15 3.92814 3.92814 3.92814 ZT16-19 5.46167 5.46167 5.46167 ZT20-23 3.989305 3.989305 3.989305