Table 2.

Median scores and scale reliability coefficients (Cronbach's alpha).

Scale group	N	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.