condition mean min max ZT0-3 21.681520105 21.07623316 22.28680705 ZT4-7 28.541883374999998 26.21151609 30.87225066 ZT8-11 26.461094024999998 26.374250144999998 26.547937904999998 ZT12-15 20.821081177499998 19.65199363 21.990168725 ZT16-19 23.446126755 22.942143925 23.950109585 ZT20-23 25.745249247500002 24.893764230000002 26.596734265000002