Table 1 Psychometric properties of the HRQoL instrument for Chinese infertile couples
Measurement property | Type | Measure |
|---|---|---|
Reliability | Internal consistency | Cronbach’s α |
Test-rest | Intraclass correlation coefficient (ICC) will be measured at baseline and at 2-week follow-up | |
Information function | Information function of each item and domain calculated according to item response theory (IRT) | |
Validity | Content validity | Item-level content validity index (I-CVI)/Scale-level content validity index (S-CVI) |
Construct validity | Explore factor analysis (EFA); Confirmatory factor analysis (CFA) | |
Convergent/discriminant validity | Spearman correlation coefficients | |
Sensitivity/responsiveness | – | Floor and ceiling effects; effect size (ES); standardized response mean (SRM); paired t test |