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Owing to a change in classification procedures in the Birth Registry in 1978, there was more missing data on gestational age for the years 1978 1981 than for other years (mean missing proportion, 21.7% for 1978 1981, compared with 2.4% for the years 1973 1977, and 0.7% for the years 1982 2002).
Markers with correlation coefficient of 1 were deleted by choosing missing proportion option.
All ANOVA analyses contained the following seven factors, each with two levels: β 1 *, β 2 *, missing proportion on X1 (missing missing proportion on X2 (m(X2)), dependency between θ* and the missing values on X1 (d(X1, θ*)), dependency between θ* and the missing values on X2 (d(X2, θ*)), and the imputation method (SMI vs. MMI).
The degree of missing was substantial for 2005/2006 and then decreased gradually, which can be seen from the number of unmatched OIE outbreaks and the values of missing proportion (MP).
The missing data were accounted for using an analysis whereby the missing proportion for each country and age group was calculated, then the PY was multiplied by (1 minus missing proportion).
MissForest has the least imputation error for continuous as well as categorical variables at each level of missing proportion, followed by MICE, NN and the mean imputation of continuous laboratory values.
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We conducted a simulation study to compare the SMI and the MMI methods when missing proportions on background variables were substantial.
Missing proportions ranged from 0.1% for seasonal flu vaccination history to 5.5% for the item "I have planned when and where to get my pH1N1 vaccination this winter".
cThe range of missing proportions across the covered surveys.
For an exact documentation of missing proportions, patterns and handling strategies, see Supplementary Appendix p. 16.
Among preterm and term deliveries, the missing proportions were 0.34 and 0.21%, respectively.
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