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However, the item parameters were largely the same across cohorts for most items, with few striking differences.
Most items with lower ICCs required participants to recall specific dates or to estimate things which occurred within a specified time frame (i.e., recall issues).
In the end, the test-retest reliability was similar for most items with both methods of administration, although we did not measure inter-interviewer reliability.
Exploratory factor analysis identified that all items had strong positive associations with the first factor, weak associations in most items with the second factor, and negative associations with items 13 21 (Additional file 1: Table S1).
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Most items correlated with factors as expected (see Table 7), with particularly high correlations seen for role-physical and bodily pain dimensions.
Most items began with "I teach because…" followed by a specific reason that matched the underlying motifs of the subscales.
For most items, as with the total score, there is only a significant main effect of time, with scores increasing between year 1 and year 2.
The construct validity [ 40] was evaluated by performing an explorative factor analysis using PCA, which showed a stable 12-factor solution for the SI and PR scales, with most items correlating strongly with the factors.
The survey had 58 items, with most items coming from the China Health and Family Life Survey, a population-representative study of sexual behaviours in China.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com