Table 6. Sensitivity and specificity of new cut-off values in this and previous studies.

	Cut-off value	Sensitivity (%)	Specificity (%)
Single scale
Q1 Chemical Intolerances	48	75.7	79.6
Q2 Other Intolerances	17	73.0	77.0
Q3 Symptom Severity	25	87.4	78.5
Q5 Life Impacts	22	85.6	92.7
Combined scales
Q1 Chemical Intolerances	30	82.0	94.4
Q3 Symptom Severity	13
Q5 Life Impacts	17
Other cut-off values
Hojo et al., 2009a		90.1	75.9
Miller and Prihoda, 1999b		44.1	97.7
Skovbjerg et al., 2012c		80.2	92.6

^aMet more than two of the three cut-off values of Q1 Chemical Intolerances ≥ 40, Q3 Symptom Severity ≥ 20, and Q5 Life Impacts ≥ 10

^bMet all cut-off values of Q1 Chemical Intolerances ≥ 40, Q2 Other Intolerances ≥ 25, and Q3 Symptom Severity ≥ 40

^cMet all cut-off values of Q1 Chemical Intolerances ≥ 35, and Q5 Life Impacts ≥ 14