Factors Associated with the Differences in Migraine Prevalence Rates between Spanish Regions

Table 3

Association analysis of the differences in migraine prevalence by a series of environmental and ecological factors defining regions.

	𝑟𝑠	P value	𝛽 (95% CI)	Mean 𝑅 (95% CI)
Air pollutants
Carbon monoxide	−0.21	0.47	−0.21 (−1.86–1.44)	0.81 (0.16–4.21)
Carbon dioxide	−0.37	0.15	−1.66 (−4.11–0.79)	0.19 (0.02–2.20)
Nitrogen oxides	−0.16	0.53	−0.72 (−3.46–2.02)	0.49 (0.03–7.58)
Sulphur oxides	−0.34	0.20	−1.03 (−2.47–0.41)	0.36 (0.08–1.50)
Weather conditions
Days registering 𝑇𝑎 below 0°C	−0.63	0.01	−0.01 (−0.01–0.00)	0.99 (0.99–1.00)
Days registering 𝑇𝑎 over 25°C	0.12	0.63	0.00 (0.00–0.00)	1.00 (1.00–1.00)
Clear days	−0.26	0.34	0.00 (−0.01–0.00)	1.00 (0.99–1.00)
Cloudy days	0.15	0.58	0.00 (0.00–0.01)	1.00 (1.00–1.01)
Total rainfall (mm)	0.03	0.91	0.00 (0.00–0.00)	1.00 (1.00–1.00)
Maximum absolute 𝑇𝑎	0.13	0.63	0.01 (−0.04–0.06)	1.01 (0.96–1.06)
Minimum absolute 𝑇𝑎	0.63	0.01	0.03 (0.01–0.06)	1.04 (1.01–1.06)
Altitude	−0.70	<0.01	−0.06 (−1.00–−0.02)	0.94 (0.91–0.98)
Ecological data
Inadequate indoor lighting	0.05	0.84	0.38 (−3.34–4.10)	1.46 (0.04–60.64)
Outdoor noises	0.18	0.49	0.94 (−1.52–3.41)	2.57 (0.22–30.33)
Neighbourhood disturbances	0.15	0.56	0.87 (−1.09–2.84)	2.40 (0.34–17.06)
Neighbourhood pollution	0.25	0.34	1.24 (−1.50–3.98)	3.45 (0.22–53.57)