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Table 2 Item discrimination (a) and difficulty parameter (b) estimates along with standard errors (±SE) for each item of the GAS-10

From: Psychometric properties and diagnostic accuracy of the short form of the geriatric anxiety scale (GAS-10)

GAS-10 Item a ± SE b1 ± SE b2 ± SE b3 ± SE
Item #4 0.941 ±.09 1.538 ±.14 3.271 ±.30 4.448 ±.43
Item #1 1.446 ±.10 −0.619 ±.06 2.267 ±.14 3.589 ±.25
Item #8 1.496 ±.17 −0.088 ±.04 1.658 ±.08 2.691 ±.13
Item #7 1.527 ±.16 −1.246 ±.06 1.092 ±.12 2.290 ±.24
Item #2 1.528 ±.12 0.836 ±.07 2.660 ±.17 3.843 ±.29
Item #5 1.750 ±.10 0.321 ±.05 1.905 ±.10 2.851 ±.16
Item #10 2163 ±.16 0.992 ±.06 2.157 ±.11 2.786 ±.16
Item #3 2.193 ±.10 0.869 ±.08 2.309 ±.07 3.439 ±.13
Item #6 2.508 ±.12 −0.012 ±.05 1.592 ±.10 2.512 ±.17
Item #9 2.618 ±.22 1.230 ±.06 2.401 ±.13 3.068 ±.20