On average, per item, the mean of missing data was 19.3percentt for peers, 10percentt for co-workers' responses and 17.7percentt for patients.
The overall mean of missing responses were: FES-I, 0.9%; FES(S), 1.0%; mSAFFE, 1.3%; and ABC, 6.9% (those that left the scales completely blank are not included in these numbers).
PROC MIXED in SAS was used to estimate least squares means, because of missing data for some traits, and to perform means separation with Tukey's HSD.
In the short run that means lots of missing girls, which some have termed a "gendercide".
Characteristics included the response rate, the completion time, the mean proportion of missing items and the mean proportion of responses which gave the highest available rating (ceiling effect).
The mean number of retained dental roots was 1.3 per participant and the adjusted mean number of missing teeth was 13.8 when third molars were assessed.
As could be expected, the lower anterior region is less prone to have absent teeth than the upper anterior region, however, the mean number of missing teeth at the age of 80 in these regions is similar (mean number of missing anterior teeth in each jaw approximately 2.5; Figure 2).
The mean proportion of missing values was highest for the Saphora-Psy questionnaire, which, however, showed the lowest mean ceiling effect.
In this paper, it uses the mean instead of missing values for numeric attribute and the most for nominal attributes.
Missing data were substituted with mean values of missing items.
