143 A Table C3 Differential item functioning between paper-based and digital administrations of the Impact! questionnaire Paper-Based Digital-Based Absolute k Observed Expected Observed Expected Difference 1 1.06 1.07 1.11 1.11 0.01 2 1.10 1.09 1.13 1.13 0.01 3 0.99 0.97 1.01 1.01 0.02 4 0.87 0.84 0.88 0.89 0.03 5 0.82 0.79 0.82 0.83 0.03 6 1.06 1.05 1.10 1.11 0.01 7 0.95 0.97 1.02 1.01 0.02 8 1.10 1.10 1.16 1.16 0.00 9 1.05 1.05 1.09 1.09 0.00 10 0.97 1.07 1.13 1.11 0.09 11 1.16 1.12 1.14 1.16 0.05 12 0.91 0.93 0.98 0.98 0.02 13 1.08 1.08 1.11 1.11 0.00 14 0.60 0.57 0.60 0.61 0.03 15 1.11 1.14 1.19 1.18 0.04
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