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Table 4 BAS-2 Graded Response Model IRT Properties

From: Body Appreciation Scale (BAS-2): measurement invariance across genders and item response theory examination

Item α β1 β2 β3 β4
1 2.09  − 2.73  − 1.43  − 0.05 1.34
2 3.71  − 1.70  − 0.61 0.50 1.71
3 3.54  − 2.12  − 1.22  − 0.11 0.89
4 5.19  − 1.68  − 0.66 0.27 1.23
5 1.87  − 2.76  − 1.33 0.11 1.54
6 4.08  − 1.31  − 0.33 0.52 1.41
7 2.90  − 1.63  − 0.51 0.40 1.41
8 2.96  − 1.61  − 0.46 0.48 1.54
9 3.04  − 1.55  − 0.61 0.27 1.32
10 3.01  − 1.38  − 0.46 0.41 1.27
  1. α defines the capacity of an item to discriminate between varying levels of body appreciation (θ)
  2. β represents the level of latent trait observed to endorse each item at a specific threshold