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Table 7 Effect of vitamin C on the FEV1 level: parameters estimating the effect modification by age and exposure to dampness

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

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%)
  1. 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.