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Except for the PANSS-EC, all parameters were analyzed on a categorical basis whereby each item at each time point was analyzed descriptively.
On the other hand, our imputation model would have been increased with 80 additional equations, if each item at each time point should have been imputed and thus prone to small strata as the single items are categorical.
The outcome variable was measured with a single item at each time point: 'Do you want to work in direct patient care after completing your residency in this specialty?'.
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To illustrate the extent to which the students in each group engaged in relational thinking on the RTT before and after the mental mathematics intervention, the percent of students in each group whose justifications were coded as Category 1 (relational thinking) on at least half of the items on the RTT (i.e., at least two of the four items) at each time point is presented in Fig. 4.
There were 191 students who answered the question correctly (choosing not more than six items) at each time point.
SKAMP-D scores were calculated as the mean of the ratings for these 4 items at each time point of each visit.
The course of the study with the specific items at each time point is described in table 1. Parents are individually randomized in an intervention group or a control group, according to a computerized random allocation generator.
As secondary outcomes, patients filled out the University of California, Los Angeles (UCLA) activity scale, Western Ontario and McMaster Universities osteoarthritis index (WOMAC), the Harris hip score (HHS) and the RAND-36 Item Health Survey at each time interval.
For the longitudinal analyses, QIDS sum scores were computed for the nine consecutive time-points by adding up the item-scores at each time-point after recoding (item 1 3, item 6/7 and item 8/9).
No participant in the group completing all questionnaires had more than 1 missing item at Time 1 or Time 2. The demographic characteristics of the groups at baseline are summarised in Table 1.
The positive proportion of answers to each item was compared at each time of follow-up using a generalised linear model with log link for the Bernoulli family and robust variance; relative differences are presented as prevalence proportion ratios (PPRs).
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