Table 3.

Results of multivariable analysis

Risk factor	OR (95% CI)	P-value
Age by 10 years
40-49	0.58 (0.23-1.48)	0.26
50-59	1.13 (0.68-1.91)	0.63
60-69†	1.0	--
70-79	0.81 (0.55-1.18)	0.26
>=80	0.92 (0.59-1.43)	0.71
Sex (female)	1.29 (0.95-1.74)	0.11
Practice experience (quintiles)
1†	1.0	--
2	0.91 (0.58-1.45)	0.71
3	1.12 (0.70-1.79)	0.63
4	0.86 (0.53-1.38)	0.53
5	0.89 (0.55-1.45)	0.65
Diabetes	0.73 (0.46-1.18)	0.20
Obesity	1.05 (0.68-1.63)	0.82
HTN or CHF*	0.79 (0.56-1.11)	0.17
PUD or GIB**	0.86 (0.48-1.53)	0.61
Glaucoma/cataract	0.89 (0.58-1.37)	0.60
Osteoporosis	0.97 (0.63-1.49)	0.90
Smoking	0.81 (0.57-1.15)	0.24
Past ILD‡	0.97 (0.54-1.72)	0.91
Asthma or COPD***	0.71 (0.48-1.05)	0.09
Dyspnea	1.33 (0.97-1.80)	0.07
Cough	1.00 (0.74-1.35)	0.99
Oxygen use	1.68 (1.14-2.49)	0.009
Past steroid use	1.64 (1.13-2.38)	0.010
Recent steroid use	5.79 (3.84-8.74)	<0.001

^†Reference category

^*Hypertension or congestive heart failure

^**Peptic ulcer disease or gastrointestinal bleeding

^***Chronic obstructive pulmonary disease

^‡Interstitial lung disease other than IPF