condition mean min max ZT0-3 4.45914 4.45914 4.45914 ZT4-7 2.9125699999999997 2.9125699999999997 2.9125699999999997 ZT8-11 4.055985 4.055985 4.055985 ZT12-15 5.186045 5.186045 5.186045 ZT16-19 7.78247 7.78247 7.78247 ZT20-23 5.6485 5.6485 5.6485