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In the third approach, the OLQ-13 was divided into test halves based on item score means and standard deviation.
Studies fulfilled 3 8 of 12 quality item scores (mean fulfilled criteria (±SD), 5.7 (2.3)); see online supplementary appendix 3).
Item-total correlation coefficients (excluding the same item in the total score), mean inter-item polychoric correlations, and mean item-total correlations (excluding the same item) were also used to assess the internal consistency.
Additional file 5 shows items scores (mean, standard deviation, median) for the two sub samples and the total sample (Table 1).
For eight items, including the general health item, higher scores mean worse problems.
Mean sum scores and mean change scores for Perceived Medical School Stress (PMSS) n = 179, and mean item score and mean change scores for Symptom Check list (SCL-5), n = 180, for students responding at both T1 and T2.
The mean item score represents the instrument mean.
The Xerostomia Inventory-Dutch version item scores and mean item scores are presented in Table 2.
Lowest scores were obtained on the schizophrenia nuclear symptoms (mean item score of.18 for both groups on a scale of 0 4), while mean item scores of psychoticism was approximately.50 for both groups.
Along with scale sum scores, a further index, 'perceived job strain' (DCS job strain) was computed by dividing the mean item score of Demand by the mean item score of the Control scale.
We therefore converted these two scores into a single score called Good Study Strategy (GSS) subtracting the mean SS item scores from the mean DS item scores.
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