condition mean min max ZT0-3 10.830548339352749 2.89869501805825 15.0214 ZT4-7 5.5979399999999995 5.5979399999999995 5.5979399999999995 ZT8-11 10.262525 10.262525 10.262525 ZT12-15 16.6692 14.41185 18.92655 ZT16-19 6.392745 6.392745 6.392745 ZT20-23 7.20962 7.20962 7.20962