Table 2.
Predicted C-reactive protein (mg/L) and fibrinogen (g/L) levels by household income and education.
| C-reactive protein (mg/L) | Fibrinogen (g/L) | |||
|---|---|---|---|---|
| Mean | 95% CI | Mean | 95% CI | |
| Equivalised net HH income | ||||
| High HH income | 1.819 | 1.737; 1.902 | 2.654 | 2.632; 2.676 |
| Middle HH income | 2.051 | 1.964; 2.137 | 2.733 | 2.711; 2.755 |
| Low HH income | 2.192 | 2.102; 2.282 | 2.778 | 2.756; 2.801 |
| Differences as % of the biomarker’s s.d.a | 20.7% | 23% | ||
| P-value trend | 0.000 | 0.000 | ||
| Education | ||||
| Degree | 1.707 | 1.611; 1.802 | 2.626 | 2.601; 2.651 |
| Other higher degree | 1.996 | 1.855; 2.136 | 2.686 | 2.651; 2.722 |
| A-level | 2.022 | 1.900; 2.143 | 2.730 | 2.699; 2.762 |
| O-level/other qualification | 2.091 | 1.996; 2.186 | 2.759 | 2.735; 2.783 |
| No qualification | 2.379 | 2.247; 2.512 | 2.821 | 2.786; 2.856 |
| Differences as % of the biomarker’s s.d.a | 33.7% | 36.2% | ||
| P-valuetrend | 0.000 | 0.000 | ||
Abbreviations: CI, confidence interval; HH, household; s.d., standard deviation.
Notes: Predicted values were obtained from OLS models (fibrinogen) and GLMs (CRP) adjusted for age, gender, region and urbanization indicators (“base model”). P-valuestrend (tests for trend in the mean values of CRP and Fibrinogen across SEP categories) were obtained by entering the SEP measures as continuous variable in the models.
aPredicted differences in the mean CRP and fibrinogen levels between the lowest and the highest SEP groups were expressed as percentages of the standard deviation of the corresponding inflammatory biomarker.