Table 3 Skeletal muscle associations estimated by multivariable linear regression model.

Age

− 0.005 (− 0.006, − 0.005)

31.8% (0.164)

-0.003 (− 0.003, − 0.002)

8.4% (0.365)

Education (none)

Reference

Some, did not complete primary

0.003 (− 0.004, 0.010)

17.2% (0.289)

0.000 (− 0.012, 0.011)

29.4% (0.183)

Completed primary

0.014 (0.007, 0.022)

0.0% (0.539)

0.005 (− 0.007, 0.016)

19.9% (0.266)

Completed secondary

0.025 (0.015, 0.035)

53.6% (0.028)

0.021 (0.007, 0.035)

33.6% (0.149)

Tertiary (college)

0.064 (0.053, 0.074)

91.8% (< 0.001)

0.038 (0.023, 0.054)

55.4% (0.022)

Marital status (never married)

Reference

Married/ cohabiting

0.005 (− 0.003, 0.014)

79.6% (< 0.001)

0.004 (− 0.010, 0.019)

0.0% (0.528)

Widowed

0.006 (− 0.003, 0.015)

78.5% (< 0.001)

0.004 (− 0.011, 0.028)

0.0% (0.457)

Divorced/ separated

0.010 (0.000, 0.021)

67.8% (0.005)

0.007 (− 0.012, 0.025)

37.5% (0.163)

Number of assets

0.003 (0.001, 0.005)

57.3% (0.016)

0.005 (0.002, 0.008)

0.0% (0.502)

Body fat

− 0.003 (− 0.003, − 0.002)

88.3% (< 0.001)

− 0.013 (− 0.014, − 0.013)

19.3% (0.222)

Physical activity (not at all/not very)

Reference

Fairly/very

0.004 (− 0.001, 0.009)

45.1% (0.068)

0.002 (− 0.005, 0.010)

0.0% (0.485)

Drinking (no drinking/heavy)

Reference

Moderate drinking

0.041 (− 0.006, 0.014)

0.0% (0.528)

− 0.003 (− 0.013, 0.006)

34.9% (0.139)

Smoking (never)

Reference

Ever

0.005 (− 0.003, 0.014)

0.0% (0.492)

0.005 (− 0.004, 0.014)

0.0% (0.721)

Number of limiting impairments (none)

Reference

One-two

− 0.004 (− 0.008, 0.001)

28.9% (0.188)

0.001 (− 0.006, 0.009)

55.6% (0.021)

More than two

0.001 (− 0.006, 0.007)

55.6% (0.021)

0.001 (− 0.010, 0.012)

60.8% (0.009)