Vitamin C and asthma in children: modification of the effect by age, exposure to dampness and the severity of asthma

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 level^a)
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.

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