Table 3.

—Respiratory Exacerbations After IPF Diagnosis

	Time After Diagnosis
	Overall	0-2 y	2-4 y	> 4 y
Person-years of follow-up	194.8	78.3	56.0	60.5
Exacerbations
IPF	26 (0.13)	9 (0.11)	6 (0.11)	11 (0.18)
Non-IPF	27 (0.14)	11 (0.14)	10 (0.18)	6 (0.10)
Total	53 (0.27)	20 (0.26)	16 (0.29)	17 (0.28)

Forty-seven patients were followed for a total of 194.8 person-years (median 3.5; range 0.2-10.8 person-years) after IPF diagnosis. During follow-up, there were 37 patients who experienced a total of 53 respiratory exacerbations requiring hospitalization (26 IPF related, 27 non-IPF related). Seventeen patients had 26 IPF-related exacerbations, and 20 patients had 27 non-IPF-related exacerbations. The data presented represent the number (rate/person-year) of exacerbations. Data are presented overall and separately for three distinct time intervals after IPF diagnosis. See Figure 1 for expansion of the abbreviation.