Table 5.
Effect modification by age for the adjusted mean differences in systolic blood pressure (mmHg) comparing continuous (natural log transformed) pollution concentrations and stove types among 147 Honduran women using either a traditional or Justa stove*
| 24-hour average air pollution concentrations1 | Age category | Adjusted mean difference in systolic blood pressure (95% CI) | P-value for interaction |
|---|---|---|---|
| Personal PM2.5 (μg/m3) (n=104) | ≥40 years (n=35) <40 years (n=69) |
3.9 (−1.5 to 9.3) −0.7 (−4.4 to 3.1) |
0.17 |
| Kitchen PM2.5 (μg/m3) (n=105) | ≥40 years (n=36) <40 years (n=69) |
5.2 (2.3 to 8.1) 0.7 (−1.7 to 3.0) |
0.02 |
| Personal BC (μg/m3) (n=105) | ≥40 years (n=35) <40 years (n=70) |
1.6 (−1.0 to 4.2) −0.2 (−2.1 to 1.7) |
0.29 |
| Kitchen BC (μg/m3) (n=106) | ≥40 years (n=36) <40 years (n=70) |
3.3 (1.1 to 5.5) 0.7 (−1.1 to 2.4) |
0.06 |
| Stove type (Traditional vs. Justa) | ≥40 years (n=52) <40 years (n=95) |
1.0 (−5.7 to 7.1) 3.6 (−1.2 to 8.5) |
0.54 |
BC=black carbon; CI=confidence interval; PM=particulate matter<2.5 μm.
*
Adjusted for: age (continuous), beds per person (continuous), body mass index (continuous), physical activity (continuous).
1
Per one unit increase in natural log transformed pollution concentration.