Table 4 Multivariable logistic regression analysis of the association between pertussis vaccination and the clinical course and treatment of pertussis, stratified for term and preterm infants (crude and adjusted OR and 95% CI)

197 (73.5%)

151 (70.9%)

0.9 (0.6–1.3)

0.8 (0.4–1.3)

17 (73.9%)

0.8 (0.3–2.7)

0.8 (0.1–5.6)

47 (17.5%)

22 (10.3%)

0.5 (0.3–0.9)

0.6 (0.3–1.1)

10 (43.5%)

0.2 (0.06–0.7)

0.2 (0.03–1.5)

6 (2.2%)

12 (5.6%)

2.6 (0.96–7.1)

1.8 (0.5–6.8)

1 (4.4%)

< 0.001 (< 0.001- > 999.9)

0.4 (< 0.001- > 999.9)

94 (35.1%)

79 (37.1%)

1.1 (0.8–1.6)

0.9 (0.6–1.6)

8 (34.8%)

1.0 (0.3–3.0)

0.6 (0.1–3.3)

15 (5.6%)

19 (8.9%)

1.7 (0.8–3.3)

1.0 (0.4–2.3)

1 (4.4%)

2.7 (0.3–25.4)

1.6 (0.1–26.1)

2 (0.8%)

2 (0.9%)

1.3 (0.2–9.0)

7.2 (0.2–226.7)

1 (4.4%)

0.6 (0.04–10.3)

0.6 (< 0.001- > 999.9)

126 (47.0%)

88 (41.3%)

0.8 (0.6–1.1)^c

1.1 (0.7–1.8)^c

5 (21.7%)

3.1 (0.9–10.0)^c

1.9 (0.3–11.6)^c

17 (6.3%)

21 (9.9%)

1.6 (0.8–3.1)

0.7 (0.3–1.7)

2 (8.7%)

1.3 (0.2–7.6)

> 999.9 (< 0.001- > 999.9)

87 (32.5%)

63 (29.6%)

0.9 (0.6–1.3)

0.9 (0.5–1.4)

10 (43.5%)

0.6 (0.2–1.8)

0.8 (0.2–4.5)

30 (11.2%)

9 (4.2%)

0.4 (0.2–0.8)

0.9 (0.4–2.5)

5 (21.7%)

0.3 (0.07–1.5)

0.2 (0.01–4.6)

37 (14.2%)

52 (25.1%)

1.8 (1.2–2.8)

1.2 (0.7–2.1)

2 (9.5%)

2.7 (0.6–11.4)

12.3 (0.8–188.3)

230 (87.5%)

157 (74.4%)

0.4 (0.3–0.7)

0.7 (0.4–1.3)

21 (95.5%)

0.3 (0.03–2.8)

1.7 (0.1–23.7)

23 (8.9%)

5 (2.4%)

0.3 (0.1–0.7)

0.8 (0.2–3.4)

7 (31.8%)

0.1 (0.02–0.7)

0.4 (0.02–5.7)

133 (50.4%)

33 (15.9%)

0.2 (0.1–0.3)

0.3 (0.2–0.5)

13 (59.1%)

0.2 (0.08–0.8)

0.6 (0.09–4.0)

42 (15.7%)

5 (2.4%)

0.1 (0.05–0.3)

0.3 (0.1–1.1)

6 (26.1%)

0.2 (0.03–0.9)

0.6 (0.04–7.6)

206 (76.9%)

162 (76.1%)

0.9 (0.6–1.3)

0.7 (0.5–1.2)

14 (60.9%)

1.9 (0.7–5.1)

2.1 (0.7–6.7)