Table 3.

Prediction model for abnormal ePFT and weighted risk score

Parameter	All Patients (n=176), n (%)*	Abnormal ePFT (n=69), n (%)†	Model Coefficient	p-value	Risk Score‡
Behavior (current or previous smoking/alcohol use)
None	76 (43)	18 (24)	reference	N/A	0
Smoking OR alcohol status	65 (37)	29 (45)	0.39	0.35	2
Smoking AND alcohol status	35 (20)	22 (63)	0.76	0.15	4
Number of parenchymal abnormalities present (cysts, strands, hyperechoic foci, and lobularity)
0	29 (16)	4 (14)	reference	N/A	0
1 or 2	112 (64)	43 (38)	1.05	0.10	6
3 or 4	35 (20)	22 (63)	1.46	0.05	8
Number of ductal abnormalities present (irregular MPD, dilated MPD, and dilated side branches)
0	124 (70)	34 (27)	reference		0
1	23 (13)	9 (39)	0.19	0.71	1
2 or 3	29 (16)	26 (90)	2.14	0.002	11
Calcifications
No	154 (88)	49 (35)	reference	N/A	0
Yes	22 (13)	20 (91)	1.79	0.03	9

^*Column % does not necessarily add to 100 due to rounding.

^†Row %

^‡Risk score was calculated by dividing each variable coefficient by the smallest coefficient in the model and rounding the ratio to the integer.