Table 4 Univariate and multivariate regression analysis of the association of factors with death among pregnant women with confirmed pH1N1 influenza*

Age, median years (IQR)

24.8 (22.9-28.3)

23.9 (21.7-28.3)

0.10

0.95 (0.90-1.01)

BMI, median (IQR)

25.99 (23.20-29.26)

27.37 (24.87-30.33)

0.02

1.10 (1.01-1.17)

1.26 (1.09-1.47)

Gestational age, median (IQR)

32 (26-37)

32 (26-38)

0.86

0.97 (0.97-1.03)

0.94 (0.86-1.03)

Comorbidity **(%)

25/317 (7.9)

6/77 (7.8)

0.97

0.98 (0.39-2.50)

Pneumonia (%)

275/311 (88.4)

75/77 (97.4)

0.03

4.91 (1.16-20.86)

0.68(0.02-2.39)

Symptoms and Lab findings

PaO₂/FiO₂, median (IQR)

PaO₂/FiO₂ ≥ 300 (%)

62/164 (37.8)

1/55 (1.8)

Referent

Referent

PaO₂/FiO₂ 201 to 300 (%)

23/164 (14.0)

2/55 (3.6)

0.18

5.39 (0.47-62.33)

2.05 (0.09-46.80)

PaO₂/FiO₂ ≤ 200 (%)

79/164 (48.2)

52/55 (94.5)

< 0.001

40.81 (5.49-303.51)

27.16 (2.64-279.70)

APACHE II score, median (IQR)

6 (3-10)

12 (8-16)

< 0.001

1.13 (1.09-1.18)

1.07 (0.98-1.18)

Dyspnoea (%)

139/315 (44.1)

58/76 (76.3)

< 0.001

4.08 (2.30-7.24)

1.81 (0.47-7.05)

Hemoptysis (%)

33/315 (10.5)

21/75 (28.0)

< 0.001

3.32 (1.79-6.18)

1.64 (0.37-7.27)

CNS symptom (%)

29/314 (9.2)

19/76 (25.0)

< 0.001

3.27 (1.71-6.24)

2.99 (0.63-14.14)

AST (u/L), median (IQR)

35 (23-65)

96.10 (44.50-159.5)

< 0.001

1.007 (1.004-1.011)

1.00 (0.99-1.00)