Fig. 2
Item characteristic curve of the 12 m-eHEALS scale items in the Rasch Analysis (n = 302). The red curve represents the expected ICC according to the Rasch model, while the blue line depicts the observed ICC. The “X” marks the average of the measurements and scores of the observations in the interval. A good model fit is indicated when the “X” on the blue line is at or very close to the red curve. The green and gray lines represent the two-sided 95% confidence intervals, calculated as approximately ± 1.96 standard errors from the red line in the vertical direction.
