Table 2 Risk factors for recurrent wheezing in the fifth year of life using logistic regression*

Sex

 Male

0.40

1.49

1.39–1.60

<.0001

 Female

reference

Race^†

 White

reference

 African-American

0.53

1.71

1.52–1.91

<.0001

 Asian

0.31

1.36

1.24–1.49

<.0001

 Hispanic

0.10

1.11

1.01–1.22

0.0356

 Other/unknown

0.22

1.25

1.09–1.44

0.0020

Maternal age, y

 <18

-0.07

0.94

0.69–1.28

0.6764

 18–34

reference

 ≥35

0.04

1.04

0.96–1.13

0.3321

Family history of asthma^†

 Unknown

reference

 Father only

0.59

1.81

1.44–2.27

<.0001

 Mother only

0.76

2.15

1.87–2.47

<.0001

 Both parents

0.53

1.70

0.61–4.71

0.3109

Siblings <5 y of age in house

 None

reference

 ≥1

-0.15

0.86

0.80–0.92

<.0001

Congenital anomaly^†

 Present

0.13

1.14

1.00-1.29

0.0493

 Absent

reference

Small for gestational age^†

 No

reference

 Yes

-0.04

0.96

0.72–1.28

0.7822

Gestational age, wk

 32–33

0.40

1.49

1.15–1.92

0.0022

 34–36

0.26

1.30

1.14–1.48

<.0001

 37

0.11

1.12

0.98–1.29

0.1049

 38–40

reference

 ≥41

-0.06

0.95

0.85–1.05

0.2717

Oxygen exposure and BPD^†

 No oxygen exposure, no BPD

reference

 <200 hours oxygen, no BPD

0.28

1.32

1.12–1.57

0.0012

 ≥200 hours oxygen, no BPD

0.69

2.00

1.37–2.90

0.0003

 BPD

1.03

2.80

1.31–5.98

0.0078

Unspecified respiratory hospitalization^†

 None

reference

 Uncomplicated hospitalization

0.50

1.65

0.98–2.79

0.0594

 Prolonged hospitalization

1.24

3.46

1.94–6.16

<.0001

Laboratory-confirmed, medically attended RSV infection^†

 None

reference

 Outpatient visit only

0.32

1.38

1.03–1.85

0.0307

 Uncomplicated hospitalization

0.68

1.98

1.39–2.81

0.0002

 Prolonged hospitalization

0.95

2.59

1.49–4.50

0.0007

Laboratory-confirmed, medically attended infection with other pathogen^†

 None

reference

 Outpatient visit only

0.26

1.30

0.62–0.69

0.4883

 Uncomplicated hospitalization

0.32

1.38

0.54–3.52

0.4981

 Prolonged hospitalization

0.74

2.10

0.76–5.80

0.1526