condition mean min max ZT0-3 58.555575 54.1969 62.914249999999996 ZT4-7 46.24615 46.24615 46.24615 ZT8-11 26.36675 26.36675 26.36675 ZT12-15 0 0 0 ZT16-19 21.42095 21.42095 21.42095 ZT20-23 42.0064 42.0064 42.0064