Hypersensitivity pneumonitis

Table 4 Probability (%) of having hypersensitivity pneumonitis*

Exposure to a known offending antigen	Recurrent episodes of symptoms	Symptoms 4–8 hours after exposure	Weight loss	Crackles
				+		-
				Serum precipitins		Serum precipitins
				+	-	+	-
+	+	+	+	98%	92%	93%	72%
+	+	+	-	97%	85%	87%	56%
+	+	-	+	90%	62%	66%	27%
+	+	-	-	81%	45%	49%	15%
+	-	+	+	95%	78%	81%	44%
+	-	+	-	90%	64%	68%	28%
+	-	-	+	73%	33%	37%	10%
+	-	-	-	57%	20%	22%	5%
-	+	+	+	62%	23%	26%	6%
-	+	+	-	45%	13%	15%	3%
-	+	-	+	18%	4%	5%	1%
-	+	-	-	10%	2%	2%	0%
-	-	+	+	33%	8%	10%	2%
-	-	+	-	20%	4%	5%	1%
-	-	-	+	6%	1%	1%	0%
-	-	-	-	3%	1%	1%	0%

* All the predictors are dichotomous variables; - indicates absent; +, present; from Lacasse et al. [4], with permission.

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