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Figure 1.

Sampling design of the Dutch calibration study.

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Table 1.

Sample characteristics.

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Table 2.

Evaluation of item fit for PROMIS items in the odd booklets at time

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Table 2 Expand

Table 3.

Differential item functioning (DIF) across age and sex in the Dutch RA sample.

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Table 3 Expand

Figure 2.

Country specific local measurement precision of two culturally biased items.

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Table 4.

Differential item functioning (DIF) across Dutch and US RA patients.

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Table 4 Expand