Fig. 6

The decision curve analysis of the nomogram for probability of early clinical pregnancy in the training cohort and validation cohort. The solid bold line represents the net benefit when no participant was considered to get early clinical pregnancy, while the solid thin line represents the net benefit when all participants were considered to get early clinical pregnancy. The area among the model curve, “treat none line” (solid bold line) and “treat all line” (solid thin line), represents the clinical usefulness of the model. The farther the model curve is to the solid bold and solid thin lines, the better clinical value the nomogram holds. Using bootstrap resampling (times = 500)