Table 3. Respiratory and Other Disorders in the Previous 12 Months, as Documented in the Parent Questionnaire.

Respiratory Disorder	Conventional Ventilation (N = 150)	HFOV (N = 154)	Adjusted Odds Ratio (95% CI)*	P Value
Wheezing — no. (%)	22 (15)	23 (15)	1.01 (0.53–1.90)	0.98
Frequency of wheezing — no./total no. (%)†				0.76
Daily	1/22 (5)	5/22 (23)
Weekly	1/22 (5)	2/22 (9)
Monthly	4/22 (18)	4/22 (18)
Less than monthly	16/22 (73)	11/22 (50)
Medication for chest problems — no./total no. (%)‡§
Antibiotic agent	22/150 (15)	18/154 (12)	0.69 (0.34–1.43)	0.32
Other medicine	24/150 (16)	23/152 (15)	0.94 (0.50–1.77)	0.85
Hospital admission — no./total no. (%)¶	15/150 (10)	18/152 (12)	0.95 (0.45–1.99)	0.89
Chest problem — no.§	4	0
Surgery — no.	8	13
Other — no.	8	5
Cerebral palsy — no.∥	13	18		0.38

^*The odds ratio was adjusted for birth weight, gestational age, and whether surfactant had been administered.

^†Data were missing for one child in the HFOV group.

^‡Analyses were based on yes versus no responses.

^§Chest problems were defined as respiratory infection and asthma.

^¶Patients may have been admitted to the hospital for multiple reasons.

^∥The analysis assumed that participants who did not respond did not have the particular health problem. Estimates were unadjusted, owing to small numbers.