From: Differential item functioning of the SF-12 in a population-based regional joint replacement registry
Covariate | MH Latent Variable | PH Latent Variable | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
No-DIF Model | DIF Model | d | No-DIF Model | DIF Model | d | |||||
Est | SE | Est | SE | Est | SE | Est | SE | |||
THA | ||||||||||
 AGE1 | 0.17 | 0.05 | 0.21 | 0.05 | 0.10 | 0.08 | 0.05 | 0.08 | 0.05 | 0.00 |
 AGE2 | 0.08 | 0.05 | 0.13 | 0.05 | 0.50 | −0.12 | 0.05 | −0.14 | 0.05 | 0.11 |
 BMI1 | 0.07 | 0.05 | 0.11 | 0.06 | 0.43 | −0.06 | 0.05 | −0.06 | 0.05 | −0.07 |
 BMI2 | −0.20 | 0.04 | −0.21 | 0.05 | −0.03 | − 0.25 | 0.04 | − 0.20 | 0.04 | − 0.20 |
 SEX | 0.32 | 0.04 | 0.28 | 0.04 | − 0.21 | 0.32 | 0.04 | 0.32 | 0.04 | −0.04 |
 COMORB | −0.53 | 0.04 | −0.52 | 0.04 | −0.13 | − 0.37 | 0.04 | − 0.33 | 0.04 | − 0.10 |
TKA | ||||||||||
 AGE1 | 0.27 | 0.04 | 0.28 | 0.04 | 0.10 | 0.27 | 0.04 | 0.24 | 0.04 | −0.11 |
 AGE2 | 0.33 | 0.05 | 0.28 | 0.04 | −0.09 | 0.22 | 0.04 | 0.19 | 0.04 | −0.19 |
 BMI1 | 0.20 | 0.06 | 0.15 | 0.06 | −0.15 | 0.12 | 0.06 | 0.13 | 0.06 | 0.07 |
 BMI2 | −0.15 | 0.04 | −0.15 | 0.04 | 0.12 | −0.29 | 0.04 | −0.27 | 0.04 | −0.10 |
 SEX | 0.30 | 0.04 | 0.30 | 0.03 | 0.09 | 0.24 | 0.03 | 0.22 | 0.03 | −0.12 |
 COMORB | −0.50 | 0.04 | −0.49 | 0.03 | 0.06 | −0.37 | 0.03 | −0.32 | 0.03 | −0.13 |