Table 2. Total, natural direct and indirect effects for mortality (1,000 person-years) estimated with Baron and Kenny and inverse odds ratio weighting approaches using follow-up years as the timescale.
| Treatment Effects (1,000 person-years)a,b (N=17,054) |
Baron and Kenny | 95% CIc | Inverse Odds Ratio Weighting | 95% CIc |
|---|---|---|---|---|
| Totald | -6.7 | (-7.9, -5.4) | -6.7 | (-7.9, -5.4) |
| Natural Direct | -5.5 | (-6.9, -4.1) | -5.5 | (-8.2, -2.6) |
| Natural Indirect | -1.2 | (-1.7,-0.69) | -1.3 | (-4.0, 1.2) |
a
Exposure: z-scored years of schooling with one standard deviation = 3 years of schooling
Mediator: z-scored literacy score with one standard deviation =2 on a 10-point scale.
b
Covariates: age, sex, race/ethnicity, self-rated childhood health status, and five indicators of early life SES combined into a single scale including mother's and father's educational attainment, father's occupational status, birth in southern US, and rural residence during childhood.
c
Obtained using nonparametric bootstrap.
d
Estimation of total effects is the same for Baron and Kenny and inverse odds ratio weighting.