condition mean min max ZT0-3 12.614225542500002 10.486637245 14.74181384 ZT4-7 17.611484195 17.15851274 18.06445565 ZT8-11 16.770527253333334 16.57653072 16.964523786666668 ZT12-15 19.57384812 19.004079620000002 20.14361662 ZT16-19 17.305926415000002 17.05056446 17.56128837 ZT20-23 18.219822281666666 17.393638906666666 19.046005656666665