condition mean min max ZT0-3 61.817499999999995 61.817499999999995 61.817499999999995 ZT4-7 54.69515 54.69515 54.69515 ZT8-11 46.848299999999995 46.848299999999995 46.848299999999995 ZT12-15 47.219 47.219 47.219 ZT16-19 61.9844 61.9844 61.9844 ZT20-23 62.2686 62.2686 62.2686