TABLE 5.

POSITIVE PREDICTIVE VALUE, SPECIFICITY, SENSITIVITY, AND NEGATIVE PREDICTIVE VALUE WHEN CLASSIFYING PATIENTS WITH IDIOPATHIC PULMONARY FIBROSIS BASED ON BEING AT LEAST AS OLD AS THE AGE INDICATED AND HAVING A HIGH-RESOLUTION COMPUTED TOMOGRAPHY INTERSTITIAL SCORE AT LEAST AS HIGH AS INDICATED

Age	HRCT Interstitial Score	PPV	Specificity	Sensitivity	NPV
30	0.2	72	0	100	NA
	0.4	72	0	100	NA
	0.6	73	5	99	67
	0.8	76	24	97	75
	1.0	85	61	88	66
35	0.2	72	0	100	NA
	0.4	72	0	100	NA
	0.6	74	11	98	67
	0.8	82	50	92	70
	1.0	90	79	73	54
40	0.2	72	0	100	NA
	0.4	72	0	100	NA
	0.6	76	24	97	75
	0.8	86	66	84	61
	1.0	97	97	32	36
45	0.2	72	0	100	NA
	0.4	73	5	99	65
	0.6	81	42	94	73
	0.8	92	84	70	52
	1.0	100	100	7	30
50	0.2	72	0	100	NA
	0.4	73	8	98	60
	0.6	85	61	88	66
	0.8	97	97	32	36
	1.0	100	100	1	28
55	0.2	72	0	100	NA
	0.4	74	13	97	63
	0.6	87	68	81	59
	0.8	100	100	8	30
	1.0	100	100	1	28
60	0.2	72	0	100	NA
	0.4	76	24	97	75
	0.6	92	84	70	52
	≥0.8	100	100	1	28
65	0.2	72	0	100	NA
	0.4	78	32	96	75
	0.6	96	95	45	40
	≥0.8	100	100	1	28
70	0.2	72	0	100	NA
	0.4	82	50	92	70
	0.6	100	100	24	34
	≥0.8	100	100	1	28
75	0.2	72	0	100	NA
	0.4	85	61	88	66
	0.6	100	100	7	30
	≥0.8	100	100	1	28
80	0.2	0	0	100	NA
	0.4	66	66	84	61
	≥0.6	100	100	1	28

Definition of abbreviations: HRCT = high-resolution computed tomography; NA = not applicable; NPV = negative predictive value; PPV = positive predictive value.

Data expressed as percentages.