Table 2. Performance of model trained on 90 percent hybrid data generated offline.

Metric	FETAL-125			OB-125
	Original model	90 percent hybrid training data (mean±SD)	p-value	Original model	90 percent hybrid training data (mean±SD)	p-value
Accuracy	97.80	97.33 ± 0.87	0.45	93.09	93.58 ± 0.33	0.12
F-score	93.40	91.99 ± 2.62	0.45	79.27	80.76 ± 0.99	0.12

Original model was benchmarked in [1]. p-values reported using the two-tailed t-test. Hybrid images were generated offline, and traditional data augmentation was applied at training time for regularization.