Table 1. Demographic and obstetric characteristics of the study population.

	HW (n = 18)	HP (n = 12)	ILI (n = 11)	PH1N1 (n = 13)	*p
Age	21.9+/−1.4	25.3+/−5.9	27.8+/−6.8	25.6+/−5.3	>0.05
Gw	n/a	25.3+/−5.9	27.8+/−6.8	20.4+/−4.3	<0.05
Patients in the 3rd trimester	n/a	2 (16.7%)	7 (63.6%)	8 (61.5%)	>0.05
Patients in the 2nd trimester	n/a	8 (66.7%)	2 (18.2%)	5 (38.5%)	>0.05
Patients in the 1st trimester	n/a	2 (16.7%)	2 (18.2%)	0 (0.0%)	>0.05
Gestations:
First	n/a	3 (25.0%)	3 (27.3%)	4 (25.0%)	>0.05
Second	n/a	6 (50.0%)	3 (27.3%)	4 (25.0%)	>0.05
Third or more	n/a	3 (25.0%)	5 (45.5%)	8 (50.0%)	>0.05
Underlying disease	0	3 (25.0%)	1 (9.1%)	5 (31.3%)	>0.05

HW. Healthy women.

HP. Healthy pregnant women.

ILI. Pregnant women with influenza-like illness.

PH1N1. H1N1pdm2009 virus-infected pregnant women.

Gw. Gestational weeks.

n/a not applicable.

*Fisher’s exact test.