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Fig. 3 | BMC Medical Research Methodology

Fig. 3

From: Item response theory and differential test functioning analysis of the HBSC-Symptom-Checklist across 46 countries

Fig. 3

Item parameter for the unidimensional GRM (Items 5–8). Notes. Item discrimination and threshold parameters with 95% CI. Items (5) irritability/bad temper, (6) feeling nervous, (7) difficulties in getting to sleep, (8) feeling dizzy. Item 5: mean = 2.08, SD = 0.45, minimum = 1.41, maximum = 3.07. Item 6: mean = 1.99, SD = 0.49, minimum = 1.14, maximum = 2.89. Item 7: mean = 1.31, SD = 0.29, minimum = 0.71, maximum = 2.52. Item 8: mean = 1.58, SD = 0.28, minimum = 0.80, maximum = 2.25. The abbreviations of the country names can be found in Table 1

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BMC Medical Research Methodology

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