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Table 4 Estimation of the parameters associated with the covariates explaining the mean of the latent trait “Physical Functioning” (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*) 3.1131 0.0834 <0.0001
Women −1.1154 0.0816 <0.0001
Survey 2003 −0.2447 0.0512 <0.0001
Ager −0.5960 0.0110 <0.0001
North −0.2809 0.0696 <0.0001
Western Paris Basin −0.1386 0.0723 0.0554
West, South-West, South-East 0.3284 0.0525 <0.0001
Women*Ager 0.0667 0.0127 <0.0001
Ager*(North, Eastern Paris Basin, West, South-West, South-East) −0.0345 0.0079 <0.0001
Variables explaining the variance of the latent trait (γσ2) Constant (σ2*) 8.9934 0.5003 <0.0001
Women −2.4176 0.4027 <0.0001
Survey 2003 3.0001 0.4436 <0.0001
Ager −0.5758 0.0650 <0.0001
Women*Ager 0.1404 0.0533 0.0084
Survey 2003*Ager −0.2560 0.0595 <0.0001
Explained variance Estimated variance without covariates: σ ^ 0 2 (k0) 9.3182 (21)
Estimated variance with covariates: σ ^ 2 (k) 6.8119 (30)
Rate of explained variances: τ 27%
  1. Ager is a categorical variable taking values 0 for the 18–24, 1 for the 25–34, 2 for the 35–44, 4 for the 45–54, 6 for the 55–64, 8 for the 65–74, and 10 for the 75–84 year-old 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.