Table 7.
Effect of vitamin C on the FEV1 level: parameters estimating the effect modification by age and exposure to dampness
| Variable | Effect of vitamin C on the FEV1 levela) |
|---|---|
| Age 7.0 yr, no exposure to dampness | +37.9% (SE 1.2%) |
| Age (per year over 7.0 yr) | -3.37% (SE 0.52%) |
| Exposure to dampness during past 1 yr | -5.8% (SE 1.2%) |
| Exposure to dampness earlier | -9.6% (SE 1.4%) |
a) These parameters are from the linear model described in the footnote of Table 6. SE, standard error. This model predicts, for example, that a 9-yr old child with exposure to dampness earlier than 1 year before the study would have 21.5% increase in FEV1 by vitamin C administration which is close to that observed (21.3%) for the older children with early dampness exposure in Table 6.