In order to minimise listwise deletion occurring as a result of missing data, variables with 20% or more missing data were excluded from multivariate analysis.
* Includes those with at least one intact GHQ-28 subscale from each time point and the same language of administration both times, N presented may not total 1095 due to small amounts of missing data, ** total scores have more missing data but are not used in the analysis, SD standard deviation, IQR interquartile range.
* Includes those with at least one intact GHQ-28 subscale and the language of administration, N presented may not total 5089 due to small amounts of missing data, ** total scores have more missing data but are not used in the analysis, SD standard deviation, IQR interquartile range.
The "less-inclusive" method omitted codons with any missing data, omitted mtDNA SRX022291 (which contained more missing data than any other mtDNA) and calculated divergence using the mutational path that minimized D N between codons with multiple substitutions.
While there were slightly more missing data points on the online RMDQ than the paper RMDQ the proportion of missing data was very low for both versions, and it would be possible to programme future online versions of the RMDQ to prevent people submitting a questionnaire containing missing data (although such an approach might result in fewer respondents overall).
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).
However, within the DCRP there was more missing data on the cause of death in jails (6.3%) than in state prisons (0.7%).
However, most previous trauma studies have had more missing data than ours [ 16].
28 However, questionnaires returned by RoI survivors had more missing data.
Accessions with seven or more missing data were not included in the genetic diversity analysis.
There were, however, more missing data for the items addressing sexual function.
