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Table 4 Probability (%) of having hypersensitivity pneumonitis*

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