condition mean min max ZT0-3 3.3575007045 2.853976569 3.8610248400000002 ZT4-7 6.578039098 5.7748487755 7.3812294205 ZT8-11 6.521060405999999 6.432694508499999 6.609426303499999 ZT12-15 8.19861420075 5.934464156 10.4627642455 ZT16-19 10.15096216925 8.734587192500001 11.567337146 ZT20-23 18.09025361 15.292118305 20.888388915