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. Author manuscript; available in PMC: 2023 Jun 30.
Published in final edited form as: J Nurs Meas. 2022 Jun 20;31(2):259–272. doi: 10.1891/JNM-2021-0007

TABLE 2.

Model Fits for 7-Factor CFAs Testing Effect of Similar Item Response Patterns

Model χ2 Δχ2 df Δdf p
Null model (i.e., of no parameters) 46434.2 1953 0
7-Factor without constrained item variances 12197.1 33716.8a 1816 75 <.0001
7-Factor with question group constrained item variances 9535.7 2661.4b 1831 15 <.0001
7-Factor with different likerts constrained item variances 13412.0 −3876.3b 2349 518 <.0001
7-Factor with all likerts constrained item variances 14500.1 −1088.1b 2346 3 ~1
a

The difference in χ2 is compared against the null model (row 1).

b

The difference in Δχ2 is compared against the 5-factor model without item variance constraints (row 2).