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Table 5 Estimation of the parameters associated with the covariates explaining the mean of the latent trait “Mental 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*) 0.5924 0.0313 <0.0001
Women −0.4654 0.0186 <0.0001
Survey 2003 −0.1824 0.0264 <0.0001
Ager −0.0936 0.0076 <0.0001
North, Western Paris Basin −0.1650 0.0319 <0.0001
East, Eastern Paris Basin −0.0872 0.0238 0.0002
West, South-West 0.1110 0.0319 0.0005
Ager*(North, West, South-West) −0.0425 0.0132 0.0005
Women*(Western Paris Basin) 0.1421 0.0552 0.0101
Variables explaining the variance of the latent trait (γσ2) Constant (σ2*) 1.6797 0.0471 <0.0001
Ager 0.1080 0.0147 <0.0001
North, Eastern and Western Paris Basins, South-East −0.1349 0.0530 0.0110
East, West, South-West −0.2305 0.0562 <0.0001
Mediterranean Basin 0.1549 0.0792 0.0505
Explained variance Estimated variance without covariates: σ ^ 0 2 (k0) 1.8377 (46)
Estimated variance with covariates: σ ^ 2 (k) 1.7436 (54)
Rate of explained variances: τ 5%
  1. Ager is a categorical variable taking values 0 for the 18–34, 1 for the 35–44, 2 for the 45–64, 3 for the 65–74, and 6 for the 75–84 age groups.
  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.