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Table 3 Regression estimates for yearly decline obtained from Monte Carlo simulations (synthetic Crawford et al. (C)/Valentin et al (V) data) including data for women and men from the Crawford et al. study

From: Rate of lumbar paravertebral muscle fat infiltration versus spinal degeneration in asymptomatic populations: an age-aggregated cross-sectional simulation study

Endpoint Variable Iteration n Mean Std. Dev. Min Max
MF + ES C (women) b(age) 10000 40 0.162 0.099 −0.222 0.502
se(b) 10000 40 0.087 0.013 0.046 0.142
Multifidus C (women) b(age) 10000 40 0.185 0.114 −0.341 0.632
se(b) 10000 40 0.105 0.014 0.057 0.159
Erector Spinae C (women) b(age) 10000 40 0.153 0.090 −0.183 0.486
se(b) 10000 40 0.079 0.013 0.040 0.133
MF + ES C (men) b(age) 10000 40 0.175 0.044 −0.005 0.328
se(b) 10000 40 0.048 0.006 0.027 0.077
Multifidus C (men) b(age) 10000 40 0.299 0.063 0.077 0.544
se(b) 10000 40 0.070 0.009 0.040 0.102
Erector Spinae C (men) b(age) 10000 40 0.113 0.032 −0.001 0.232
se(b) 10000 40 0.035 0.005 0.021 0.055
MF + ES C b(age) 10000 80 0.169 0.060 −0.072 0.370
se(b) 10000 80 0.055 0.005 0.037 0.080
Mulitfidus C b(age) 10000 80 0.244 0.071 −0.036 0.509
se(b) 10000 80 0.068 0.006 0.044 0.094
Erector Spinae C b(age) 10000 80 0.132 0.059 −0.088 0.435
se(b) 10000 80 0.051 0.005 0.036 0.070
Psoas V b(age) 10000 24 0.044 0.024 −0.048 0.126
se(b) 10000 24 0.024 0.004 0.012 0.041
Multifidus V b(age) 10000 24 0.105 0.048 −0.064 0.297
se(b) 10000 24 0.048 0.007 0.025 0.074
Erector Spinae V b(age) 10000 24 0.072 0.034 −0.088 0.208
se(b) 10000 24 0.034 0.005 0.017 0.055
MF + ES V b(age) 10000 24 0.088 0.040 −0.061 0.239
se(b) 10000 24 0.040 0.006 0.018 0.062
  1. b(age) regression estimate of yearly decline per age year, se(b) standard error of b(age), Iteration number of iterations in the Monte Carlo simulation, n sample size, Std. Dev. standard deviation