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A potential disadvantage of the agreement frequency method lies in the need for an arbitrary choice of a threshold difference below which "agreement" or "match" is defined.
To be clinically relevant we have thus opted to also report the agreement frequency, that is, the percent of matches, here defined as differences within 20% of the mean.
Likert scores for each item, per participant, were allocated into categories of importance (low: 0 to 4; moderate: 5 to 6; high: 7 to 8 and very high: > 8) and per cent agreement (frequency of respondents) was calculated for each category.
Answers from participants who completed both telephone and web surveys showed strong to excellent agreement between the two types of surveys on pesticide use/non-use 74-955% agreement), frequency of use (68-90% agreement for low frequency users), and who applied the pesticide in the home 70-800% agreement).
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For example, intermarking reliability for orbicularis oculi and zygomaticus was characterized by high agreement frequencies, while ICCs were low.
Figure 4 displays the mean interrater ICC (with standard deviation), agreement frequencies, and coefficients of variation per muscle on each side.
When facial marking was performed on two different days, only frontalis measurements retained excellent intrarater reliability, as well as orbicularis oculi but for agreement frequencies only.
Then, we measured the intrarater reliability for marker positioning ("intermarking"), by calculating intraclass correlation coefficients and agreement frequencies between the distances measured in two video acquisitions performed one week apart for each patient, for each muscle on each side.
First, we measured the intrarater reliability for video analysis ("interreview") by calculating intraclass correlation coefficients and agreement frequencies between distances measured twice one week apart from the same video acquisition, for each muscle on each side.
Interrater reliability was again good only for frontalis and questionable for orbicularis oculi and zygomaticus, these two muscles being characterized by small coefficients of variation (less than 16%) and agreement frequencies close to 70% on average, but by ICCs far below 70%.
Figures 3(a) and 3(b) display the mean intrarater ICC (with standard deviation) and agreement frequencies (AF) per muscle on each side, between two video-analyses from the same marker positioning ("interreview", Figure 3(a)) and between analyses from two different markings made one week apart ("intermarking", Figure 3(b)).
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