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Fig. 2 | BMC Medical Research Methodology

Fig. 2

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

Fig. 2

Item parameter for the unidimensional GRM (Items 1–4).Notes. Item discrimination and threshold parameters with 95% CI. Items (1) headache, (2) stomachache, (3) backache, (4) feeling low. Item 1: mean = 1.44, SD = 0.25, minimum = 0.71, maximum = 2.22. Item 2: mean = 1.30, SD = 0.27, minimum = 0.66, maximum = 1.98. Item 3: mean = 1.11, SD = 0.28, minimum = 0.62, maximum = 2.15. Item 4: mean = 2.04, SD = 0.38, minimum = 0.88, maximum = 2.67. The abbreviations of the country names can be found in Table 1

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BMC Medical Research Methodology

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