Table 4.

Association of subsequent pregnancy on the risk of recurrence, after propensity score matching

	Hazard ratio	95% Confidence interval		p-value
Group 1 (n=992)
Non-pregnancy	1.000
Pregnancy	0.487	0.398	0.595	< 0.001
Group 2 (n=740)
Non-pregnancy	1.000
Failed to deliver	0.760	0.561	1.030	0.077
Group 3 (n=1,244)
Non-pregnancy	1.000
Successful delivery	0.317	0.235	0.429	< 0.001
Group 4 (n=608)
Failed to deliver	1.000
Successful delivery	0.503	0.331	0.766	0.001