condition mean min max ZT0-3 6.608485 6.257055 6.9599150000000005 ZT4-7 5.5336549999999995 5.5336549999999995 5.5336549999999995 ZT8-11 5.946145 5.946145 5.946145 ZT12-15 0 0 0 ZT16-19 7.066265 7.066265 7.066265 ZT20-23 7.086285 7.086285 7.086285