Seasonal and Weather Effects on Rheumatoid Arthritis: Myth or Reality?

Table 4

Multiple linear regression coefficients.

	TJC		VAS		SJC		DAS28
	β	95% CI	β	95% CI	β	95% CI	β	95% CI
Winter
Minimal T°	0.504	0.01, 0.49	0.161	−0.19, 0.39	−0.006	−0.18, 0.17	0.083	−0.12, 0.18
Maximal T°	−0.664	−0.55, −0.01	−0.203	−0.44, 0.23	0.076	−0.18, 0.22	−0.131	−0.21, 0.13
Humidity	0.122	−0.01, 0.03	0.222	−0.00, 0.05	0.184	−0.01, 0.03	0.174	−0.01, 0.03
Wind speed	−0.085	−0.07, 0.03	−0.132	−0.10, 0.03	0.089	−0.02, 0.05	0.054	−0.03, 0.04
Precipitations	−0.196	−0.37, 0.09	−0.015	−0.3, 0.274	−0.046	−0.19, 0.15	−0.191	−0.23, 0.06
Barometric pressure	−0.101	−0.07, 0.03	−0.059	−0.08, 0.04	0.063	−0.03, 0.05	−0.076	−0.04, 0.02
R^2	0.09
Spring
Minimal T°	0.055	−0.12, 0.17	0.236	−0.03, 0.26	0.180	−0.04, 0.16	0.117	−0.04, 0.10
Maximal T°	0.366	−0.18, 0.08	−0.399	−0.32, − 0.06	−0.105	−0.12, 0.06	−0.206	−0.11, 0.02
Humidity	0.157	−0.01, 0.06	0.012	−0.04, 0.04	0.248	0.00, 0.05	0.165	−0.01, 0.03
Wind speed	−0.071	−0.06, 0.03	−0.035	−0.05, 0.04	0.025	−0.03, 0.03	−0.061	−0.03, 0.02
Precipitations	−0.114	−0.12, 0.04	−0.209	−0.15, 0.00	−0.055	−0.07, 0.04	−0.212	−0.07, 0.00
Barometric pressure	0.023	−0.10, 0.12	−0.098	−0.16, 0.07	0.158	−0.03, 0.13	0.080	−0.04, 0.07
Summer
Minimal T°	−0.534	−0.38, − 0.09	−0.699	−0.41, − 0.14	−0.593	−0.24, − 0.06	−0.631	−0.18, −0.04
Maximal T°	0.471	0.13, 0.40	0.420	0.08, 0.34	0.442	0.06, 0.23	0.346	0.01, 0.14
Humidity	−0.056	−0.04, 0.03	−0.088	−0.04, 0.02	−0.019	−0.02, 0.02	−0.334	−0.03, −0.003
Wind speed	−0.287	−0.24, − 0.01	−0.328	−0.24, − 0.02	−0.453	−0.19, − 0.05	−0.302	−0.10, −0.003
Precipitations	0.293	0.94, 4.16	−0.092	−2.19, 0.75	0.074	−0.62, 1.39	0.092	−0.39, 1,05
Barometric pressure	0.141	−0.06, 0.37	−0.213	−0.40, − 0.01	0.042	−0.11, 0.16	−0.058	−0.12, 0.07
R^2	0.21		0.198		0.15		0.12

, , and . TJC: tender joint count; VAS: patient’s pain assessed by the visual analogue scale; SJC: swollen joint count; T°: temperature.