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Table 3 Estimation of the parameters associated with the covariates explaining the mean of the latent trait “General Health” (β μ ) and with the covariates explaining the variance of the latent trait (γσ 2 )

From: Spatio-temporal Rasch analysis of quality of life outcomes in the French general population. Measurement invariance and group comparisons

  Effect Estimate Standard error p-value
Variables explaining the mean of the latent trait (βμ) Constant (μ*) 0.8238 0.0415 <0.0001
Women −0.2121 0.0267 <0.0001
Survey 2003 −0.1393 0.0413 0.0007
Ager −0.0349 0.0019 <0.0001
East −0.2039 0.0480 <0.0001
West 0.1259 0.0344 0.0003
South-West −0.0666 0.0301 0.0272
Ager*Women 0.0049 0.0013 0.0002
Ager*sample2003 −0.0030 0.0018 0.1047
Ager* (North, West) −0.0046 0.0013 0.0004
Ager* (East) 0.0062 0.0024 0.0096
Survey 2003*(North, Eastern Paris Basin) −0.1172 0.0233 <0.0001
Survey 2003*(Western Paris Basin, South-East) −0.0675 0.0266 0.0113
Variables explaining the variance of the latent trait (γσ2) Constant (σ2*) 1.4130 0.0791 <0.0001
Survey 2003 −0.1499 0.0837 0.0730
Ager −0.0068 0.0034 0.0439
East −0.2334 0.0513 <0.0001
South-West −0.1254 0.0534 0.0188
Ager*Survey 2003 0.0068 0.0037 0.0632
Explained variance Estimated variance without covariates: σ ^ 0 2 (k0) 1.4272 (37)
Estimated variance with covariates: σ ^ 2 (k) 1.2406 (50)
Rate of explained variances: τ 13%
  1. Ager is a categorical variable taking values 0 for the 18–24, 2 for the 25–34, 12 for the 35–44, 17 for the 45–54, 24 for the 55–64, 32 for the 65–74, and 40 for the 75–84 year-olds.
  2. Women is a variable coded 1 for women and 0 for men.
  3. Survey 2003 is coded 1 for the year 2003 and 0 for year 1995.
  4. Region names are dummy variables coded 1 for the cited region and 0 for other geographical areas.