Depending on the test performance results in the derivation part of the study, the sample size of subjects for the validation study would be adjusted accordingly.
Second, it applies even when the outcome and independent variables are continuous, provided sampling of subjects for the validation study is random within categories.
A cohort of 24 subjects was used for the proteomic analysis, a cohort of 52 subjects for the validation phase and 56 hypertensive patients for the microalbuminuria test.
39 When available, internal validation data from the study of interest are the recommended data to inform the values used for sensitivity analysis, so long as the internal validation study itself was not biased by, for example, selection of subjects into the validation substudy.
We deem important to acknowledge that for the discriminative validity analysis, subjects from the validation of the OHIP-49Sp were considered.
The clinical characteristics of the subjects in the validation study are shown in Table 1.
Figure 7 displays the graphical comparison between the Kaplan-Meier curve, i.e., the observed survival curve (continuous black line), and the average predicted survival curves (continuous line) of the subjects in the validation set, for both the clinical (red) and combined (green) models.
The relationship between the true outcome Y and the auxiliary outcome A in the available observations can inform about the missing values of Y. Let V be a subsample of the study subjects, termed the validation sample, for which both true and auxiliary outcomes are available.
In the same subjects, which were part of the validation set above, the six glycopeptides panel based on SRM assay technology had AUC of 0.94 (95% CI, [0.86, 0.99]) and accuracy of 86% (95% CI, [71, 96]) at the 0.61 cut-off, indicating a discriminatory power similar to that of the ELISA assay.
Out of the 130 subjects recruited for the validation process, 91 subjects replied a second time to the questionnaire sent 1 month later.
