Table 2: Median scores and scale reliability coefficients (Cronbach’s alpha).

Scale group Symptom scale Chemical intolerance scale Other intolerance scale Life Impact scale Median (IQR)** Alpha*** Median (IQR) Alpha Median (IQR) Alpha Median (IQR) Alpha Patient sample 189 47 (30–64) 0.84 80 (62–91) 0.91 34 (20–53) 0.83 64 (45–80) 0.89 Population 1309 11 (5–23) 0.86 13 (4–30) 0.92 10 (3–19) 0.77 2 (0–8) 0.86 Population*  −30 201 12 (5–23) 0.83 11 (4–24) 0.87 11 (3–19) 0.64 4 (0–10) 0.74  30–40 218 11 (4–21) 0.85 15 (5–31) 0.93 11 (5–22) 0.79 2 (0–8) 0.86  40–50 288 11 (6–22) 0.89 14 (5–30) 0.92 11 (5–18) 0.79 2 (0–8) 0.90  50–60 312 12 (5–23) 0.86 14 (4–32) 0.94 8 (3–17) 0.78 1 (0–9) 0.87  60− 290 10 (4–23) 0.86 12 (1–29) 0.93 5 (0–17) 0.75 0 (0–5) 0.81

*Population sample grouped by age. **Interquartile range. ***Cronbach’s alpha.