Table 4 Relative risk estimates of subjective symptoms of primary interest for categories of exposure to microwaves from base stations in the bedroom against lowest exposure category.

Symptom	Exposure category (mW/m2)	% with symptom	Relative risk*	95% CI	p value
Headaches	⩽0.1†	61	1.00		0.017
	0.1–0.5	66	1.36	0.62–2.99
	>0.5	79	3.06	1.22–7.67
Vertigo	⩽0.1 †	17	1.00		0.306
	0.1–0.5	27	1.27	0.50–3.22
	>0.5	32	1.54	0.68–3.50
Palpitations	⩽0.1†	26	1.00		0.444
	0.1–0.5	32	1.06	0.45–2.47
	>0.5	38	1.37	0.61–3.11
Tremor	⩽0.1†	12	1.00		0.062
	0.1–0.5	9	0.68	0.19–2.41
	>0.5	26	2.37	0.96–5.87
Hot flushes	⩽0.1†	32	1.00		0.739
	0.1–0.5	26	0.90	0.39–2.09
	>0.5	26	0.87	0.37–2.01
Sweating	⩽0.1 †	34	1.00		0.455
	0.1–0.5	38	1.05	0.47–2.32
	>0.5	40	1.35	0.61–2.97
Cold hands or feet	⩽0.1†	40	1.00		0.019
	0.1–0.5	46	1.03	0.40–2.63
	>0.5	62	2.57	1.16–5.67
Loss of appetite	⩽0.1†	13	1.00		0.069
	0.1–0.5	17	1.23	0.42–3.57
	>0.5	24	2.40	0.93–6.18
Loss of energy	⩽0.1†	63	1.00		0.886
	0.1–0.5	63	1.32	0.61–2.84
	>0.5	58	1.06	0.49–2.27
Exhaustion	⩽0.1†	44	1.00		0.098
	0.1–0.5	41	0.77	0.30–2.02
	>0.5	51	2.07	0.87–4.89
Tiredness	⩽0.1†	64	1.00		0.258
	0.1–0.5	89	1.97	0.64–6.10
	>0.5	88	1.92	0.62–5.96
Difficulties to concentrate	⩽0.1†	60	1.00		0.035
	0.1–0.5	64	1.32	0.61–2.86
	>0.5	76	2.55	1.07–6.08
Feeling strained	⩽0.1†	44	1.00		0.450
	0.1–0.5	51	1.67	0.76–3.65
	>0.5	40	0.74	0.33–1.63
Urge for sleep	⩽0.1†	47	1.00		0.630
	0.1–0.5	54	1.21	0.56–2.61
	>0.5	51	1.17	0.53–2.54

p values for exposure factor are shown.

*Adjusted for age, sex, region, regular use of mobile telephone, and fear of adverse effects of the base station.

†Reference category.