condition mean min max ZT0-3 67.145546 67.145546 67.145546 ZT4-7 53.640804 53.640804 53.640804 ZT8-11 63.346922 63.346922 63.346922 ZT12-15 58.194864499999994 58.194864499999994 58.194864499999994 ZT16-19 102.2294245 102.2294245 102.2294245 ZT20-23 84.0198335 84.0198335 84.0198335