TABLE 2.

RESPIRATORY SUPPORT AND MEAN FiO2 FOR EACH OUTCOME BY POSTNATAL DAY (ROW PERCENTS)

Day	Respiratory Support	No BPD	Mild BPD	Moderate BPD	Severe BPD	Death
		Maximum N = 1,218	Maximum N = 757	Maximum N = 714	Maximum N = 472	Maximum N = 468
1	HFV, %	6	16	22	17	39
	CMV, %	27	23	22	15	13
	NCPAP, %	63	15	11	7	4
	Nasal cannula, %	74	18	5	3	0
	No ventilation, %	85	8	3	0	5
	Mean FiO2, %	38	39	42	46	53
3	HFV, %	7	19	24	19	31
	CMV, %	16	25	28	18	14
	NCPAP, %	53	20	14	9	4
	Nasal cannula, %	63	22	8	4	3
	No ventilation, %	87	6	3	2	3
	Mean FiO2, %	35	37	37	38	47
7	HFV, %	1	14	31	24	31
	CMV, %	7	25	31	24	13
	NCPAP, %	37	28	21	10	5
	Nasal cannula, %	56	24	12	6	2
	No ventilation, %	86	7	4	1	2
	Mean FiO2, %	41	37	36	37	44
14	HFV, %	1	11	30	33	26
	CMV, %	5	25	34	27	10
	NCPAP, %	27	33	24	13	3
	Nasal cannula, %	47	32	17	3	2
	No ventilation, %	93	3	2	2	2
	Mean FiO2, %	44	42	43	46	54
21	HFV, %	1	12	33	34	20
	CMV, %	5	23	36	29	9
	NCPAP, %	22	37	26	13	2
	Nasal cannula, %	43	34	17	5	2
	No ventilation, %	97	1	1	1	1
	Mean FiO2, %	41	42	44	47	55
28	HFV, %	1	11	31	39	19
	CMV, %	4	20	37	32	7
	NCPAP, %	16	37	30	16	1
	Nasal cannula, %	32	41	21	5	1
	No ventilation, %	97	1	1	1	1
	Mean FiO2, %	36	41	44	47	54

Definitions of abbreviations: BPD = bronchopulmonary dysplasia; CMV = conventional mechanical ventilation; HFV = high-frequency ventilation; NCPAP = nasal continuous positive airway pressure.