Supplementary Material Table 2:

Parameter / FF / T1 / T2 / MTR
Correlate / Age / Gender / Weight / Age / Gender / Weight / Age / Gender / Weight / Age / Gender / Weight
Side / R / L / R / L / R / L / R / L / R / L / R / L / R / L / R / L / R / L / R / L / R / L / R / L
TA / + / - / + / + / + / ---
PL / - / + / - / ---
GL / ++ / ++ / -- / + / + / ++ / --- / -
GM / ++ / - / + / + / + / - / - / ++ / ++ / + / --- / ---
SO / - / - / + / - / - / -- / - / +
TP / ++ / + / +++ / - / --
Calf / + / ++ / ---
RF / + / + / + / ++ / - / + / - / --- / ---
VM / + / ++ / + / + / + / + / -- / ---
VI / + / + / ++ / ++ / +++ / -- / --
VL / + / ++ / + / ++ / ++ / ++ / + / - / -- / - / --- / -- / --
SM / + / - / ++ / + / - / -- / + / - / +++ / --- / -- / - / -
ST / + / + / - / - / --- / --- / --
BF / +++ / + / ++ / +++ / - / +++ / + / ++ / --- / --- / -- / -- / -
AM / ++ / + / - / + / + / ++ / ++ / - / - / - / ---
SA / - / - / - / -
GR / + / + / - / + / + / -- / - / --
Thigh / + / ++ / - / ++ / ++ / --- / --- / ---

Title

Summary of multivariate regression analysis of associations between demographic factors and MRI measures in thigh and calf muscles of healthy volunteers.

Footnote

Regression performed on each muscle separately. Calf and thigh columns refer to mean of all ROIs for each subject, full regression parameters for this are outlined in table 2 in the main text. The most consistent correlations are: positive between subject weight and thigh muscle FF, subject age and calf or thigh muscle T2, subject weight and thigh T2, and negative between subject age and MTR in thigh and calf, female gender and MTR in thigh, subject weight and MTR in thigh.

+ = positive correlation, 0.01>p>0.05

++ = positive correlation, 0.01>p>0.001

+++ = positive correlation, p<0.001

- = negative correlation, 0.01>p>0.05

-- = negative correlation, 0.01>p>0.001

---= negative correlation, p<0.001

FF: fat fraction, MTR: magnetisation transfer ratio, R: right, L: left, RF: rectus femoris, VM: vastus medialis, VI: vastus intermedius, VL: vastus lateralis, Sa: sartorius, SM: semimembranosus, ST semitendinosus, BF: biceps femoris (long head), AM: adductor magnus, G: gracilis, TA: tibialis anterior, TP: tibialis posterior, PL: peroneus longus, So: soleus, MG: medial head of gastrocnemius, LG: lateral head of gastrocnemius