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Table 4 Variation in quality explained by regression models

From: Quality of sickness certification in primary health care: a retrospective database study

Quality parameter Model description Parameter estimates
Y variable R2 X variable Regression coefficient t-value Pr > |t| 95% Confidence limits
      Sign parameter Lower limits Upper limits
1. Number of days on first certificate 29.5% Time −0.94 −10.96 <.0001 −1.10 −0.77
Age group 1.97 18.96 <.0001 1.77 2.17
2. Face-to-face meeting 15.6% Time 0.02 13.24 <.0001 0.02 0.02
Age group −0.01 −6.06 <.0001 −0.01 −0.01
3. Non-specific diagnoses 1.14% Sex 0.02 3.62 0.0003 0.01 0.04
4. Documentation of need for vocational rehabilitation 5.7% Time 0.03 7.84 <.0001 0.02 0.04
Age group −0.01 −2.80 0.0052 −0.02 −0.00
5. Documentation of prognosis 7% Time 0.03 9.25 <.0001 0.03 0.04
6. Complete certificates 27.6% Time 0.04 20.48 <.0001 0.04 0.05
Age group −0.01 −4.13 <.0001 −0.02 −0.01
7. Acceptable certificates 34% Time 0.05 24.53 <.0001 0.04 0.05
  1. Variation in quality explained by models with the seven parameters as dependant variables (y) and time, sex and age group as explanatory variables (x).