Table 5: Sensitivity, specificity, and optimal cut-off values for the chemical intolerance scale and the Life Impact Scale.

Chemical intolerance cut-off scoresSensitivity (%)Specificity (%)

 3795.282.8
 4789.389.4
 5883.995.2

Life Impact Scale cut-off scoresSensitivitySpecificity

 1495.886.2
 2191.090.9
 3186.895.2

Combined scale scoresSensitivitySpecificity

Chemical intolerance cut-off 35/Life Impact Scale cut-off 1492.191.8