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Table 1 Incidence rates of hospitalization for bronchiolitis in the first 18 months of age in premature infants, Rome, Italy, 2000-2006

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

 

Person years

(PY)

Cases

Rate

(per 100 PY)

95% CI

Age (months)

    

[0 -- 6]

986

88

8.93

7.24 -11.00

(6 - 12]

1005

42

4.18

3.09 -5.65

(12 - 18]

921

7

0.76

0.36 -1.59

Calendar month

    

January

223

25

11.20

7.57 -16.57

February

226

24

10.64

7.13 -15.87

March

227

14

6.18

3.66 -10.43

April

229

12

5.23

2.97 -9.21

May

235

4

1.70

0.64 -4.54

June

238

3

1.26

0.41 -3.90

July

245

2

0.82

0.20 -3.27

August

251

3

1.20

0.39 -3.71

September

254

3

1.18

0.38 -3.66

October

257

12

4.67

2.65 -8.22

November

262

18

6.88

4.33 -10.91

December

266

17

6.39

3.98 -10.29

Year of observation

    

2000

138

7

5.07

2.42 -10.63

2001

399

17

4.26

2.65 -6.85

2002

427

22

5.15

3.39 -7.82

2003

436

30

6.88

4.81 -9.84

2004

503

18

3.58

2.25 -5.68

2005

527

23

4.36

2.90 -6.56

2006

481

20

4.16

2.68 -6.44

Total

2912

137

4.70

3.98 -5.56