Table 3.

Cox proportional hazard regression comparing mortality and hospitalizations among patients with idiopathic pulmonary fibrosis with and without metformin use

		Rate per 100 (95% CI)
	Before propensity score matching		After propensity score matching		Hazard ratio (95% CI)	p value
	No metformin (n = 2222)	Metformin (n = 1377)	No metformin (n = 1100)	Metformin (n = 1100)
Death	25.1 (23.3, 27.1)	10.5 (8.7, 12.5)	20.6 (18.4, 23.2)	10.5 (8.5, 12.8)	0.46 (0.36, 0.58)	< 0.001
Hospitalization	76.1 (72.0, 80.6)	55.12 (50.4, 60.3)	64.3 (59.2, 69.9)	57.8 (52.4, 63.8)	0.82 (0.72, 0.93)	0.003