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 |