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Table 3 Crude (CIRR) and adjusted (AIRR) incidence rate ratios of hospitalization for bronchiolitis, Rome, Italy 2000-2006

From: Incidence and risk factors of hospitalization for bronchiolitis in preterm children: a retrospective longitudinal study in Italy

  

CIRR (95% CI)

p-value

AIRR (95% CI)

p-value

Age of the mother (years)

≥ 32 vs. <32

1.13 (0.80 -1.58)

0.49

1.08 (0.75 -1.55)

0.67

Parity

1 vs. 0

1.28 (0.88 -1.86)

0.19

1.34 (0.91 -1.98)

0.14

 

≥ 2 vs. 0

1.04 (0.59 -1.83)

0.89

1.09 (0.60 -1.95)

0.78

Years of education

≤ 8 vs. >8

1.74 (1.23 -2.46)

<0.01

1.71 (1.18 -2.48)

0.01

 

Not known vs. >8

9.51 (0.88 -102.1)

0.06

9.82 (0.79 -122.4)

0.08

Birth country of the mother

Italy vs. other

1.07 (0.65 -1.78)

0.78

1.30 (0.73 -2.30)

0.37

Gender

male vs female

1.47 (1.03 -2.08)

0.03

1.48 (1.04 -2.10)

0.03

Calendar year (ref. 2001)

2000

1.19 (0.49 -2.86)

0.70

0.79 (0.33 -1.88)

0.60

 

2002

1.21 (0.64 -2.28)

0.56

1.28 (0.68 -2.43)

0.44

 

2003

1.61 (0.89 -2.93)

0.12

1.73 (0.95 -3.16)

0.07

 

2004

0.84 (0.43 -1.63)

0.61

0.92 (0.47 -1.79)

0.81

 

2005

1.02 (0.54 -1.92)

0.94

1.24 (0.66 -2.34)

0.50

 

2006

0.98 (0.51 -1.87)

0.94

1.16 (0.60 -2.24)

0.66

Age (months)

<6 vs. ≥ 12

11.75 (5.44 -25.35)

<0.01

14.54 (6.75 -31.35)

<0.01

 

6-11 vs. ≥ 12

5.50 (2.47 -12.24)

<0.01

5.98 (2.68 -13.35)

<0.01

Epidemic period

Yes vs. No

5.89 (3.44 -10.06)

<0.01

5.48 (3.22 -9.35)

<0.01

Birth weight

per 100 g decrease

1.05 (1.02 -1.07)

<0.01

1.06 (1.02 -1.11)

0.01

Gestational age

per 1 week less

1.08 (1.02 -1.14)

0.01

0.97 (0.88 -1.07)

0.58

Apgar score

≤ 7 vs. > 7

2.06 (1.40 -3.03)

<0.01

1.57 (0.99 -2.48)

0.05

Broncho-dysplasia

Yes vs. No

2.08 (0.91 -4.75)

0.08

1.70 (0.68 -4.28)

0.26

Congenital heart disease

Yes vs. No

1.63 (0.51 -5.18)

0.41

1.64 (0.52 -5.19)

0.40