condition mean min max ZT0-3 32.592585 32.592585 32.592585 ZT4-7 30.430719500000002 30.430719500000002 30.430719500000002 ZT8-11 33.250708 33.250708 33.250708 ZT12-15 25.9659285 25.9659285 25.9659285 ZT16-19 29.031808499999997 29.031808499999997 29.031808499999997 ZT20-23 26.8603475 26.8603475 26.8603475