Table 2.

characteristics of predictors of ILD^†

Characteristics	ILD	No ILD	OR (95% CI)*	P value**
CTD
Overall	n=326	n=124
Age (year)§	59 (50–68)	63 (53–70)	0.94 (0.87–1.02)	ns
Female	223 (68)	93 (75)	0.72 (0.45–1.15)	ns
White	262 (80)	111 (90)	0.48 (0.25–0.91)	0.024
Smoking				0.002
Never	176 (54)	55 (44)	Ref.
Previous	141 (43)	55 (44)	0.80 (0.52–1.24)
Current	9 (3)	14 (11)	0.20 (0.08–0.49)
No CTD
Overall	n=930	n=2193
Age (year)§	72 (65–77)	66 (54–74)	1.24 (1.20–1.28)	<0.001
Female	368 (40)	1077 (49)	0.68 (0.58–0.79)	<0.001
White	763 (82)	1857 (85)	0.83 (0.67–1.01)	0.067
Smoking				<0.001
Never	365 (39)	921 (42)	Ref.
Previous	545 (59)	1072 (49)	1.28 (1.09–1.50)
Current	20 (2)	200 (9)	0.25 (0.16–0.41)

^†ILD, interstitial lung disease; CTD, connective tissue disease; OR, odds ratio; CI, confidence interval;

^§Values are median (IQR) or number (percentage);

^*odds ratios represents 5 year increase in age;

^**P-values are from logistic regression; ns, not significant