Statistical analyses
Tooth, tooth
SECONDARY
The statistical analyses were carried out with the use of a statistical software package (IBM SPSS Statistics for Windows, Version 28; IBM, Armonk, New York, USA). Participants showing outlying values (defined as three standard deviations from the mean) in any of the behavioral parameters were excluded from final analyses to avoid distorted data. For data description, means and standard deviations and Cohen’s d as a measure of effect size were computed; in the case of skewed data, they were supplemented by quartiles and medians (shown in the The primary outcomes of research Hypothesis a) (brushing to the best of one’s abilities will lead to a different performance) were tooth contact time and time at occlusal and outer surfaces. Tooth contact time at inner surfaces, percentages of time by which the respective surfaces were brushed, percentages of time by which specific brushing movements were applied, and the QIT-S are the secondary outcome variables.The primary outcome of research Hypothesis b) (brushing to the best of one’s abilities will lead to a higher degree of achieved oral cleanliness) was the overall MPI. The percentage of surfaces scoring 3–5 (TQHI % 3–5 overall) was the secondary outcome variable.The primary outcome of research Hypothesis c) (brushing to the best of one’s abilities will lead to a higher subjectively perceived oral cleanliness) was the overall SPOC