Table 3. Distribution of cases of spontaneous abortion following 2009 H1N1 vaccines from the passive surveillance and large-linked databases, November 1, 2009–August 31, 2010, by vaccine type.

Vaccine type	Capturing source		Number of cases ascertained	Capture-recapture estimator of total cases (95% CIa)
	Passive surveillance database	Large-linked database
Unadjuvanted vaccine	Yes	Yes	5	295 (167–522)
	Yes	No	10
	No	Yes	105
MF59®-adjuvanted vaccine	Yes	Yes	1	25 (25–25)
	Yes	No	0
	No	Yes	24

^aCI, confidence interval.