Association between weather and utilisation of physical therapy in patients with osteoarthritis: a case-crossover study

Table 2 Univariate analysis: meteorologic exposures and frequency of PT

	Odds Ratio (95% CI)	SE	z	P
Mean temperature (°C)	1.02 (1.01–1.04)	0.01	3.83	< 0.01*
Daily highest temperature (°C)	1.04 (1.02–1.05)	0.01	4.59	< 0.01*
Daily minimum temperature (°C)	1.01 (1.01–1.02)	0.01	3.09	< 0.01*
Diurnal temperature range (°C)	1.11 (1.00–1.23)	0.06	1.90	0.06
Relative humidity (%)	0.99 (0.98–1.01)	0.01	-0.76	0.45
Barometric pressure (hPa)	0.99 (0.98–1.00)	0.01	-2.13	0.03*
Daily precipitation (mm)	0.99 (0.96–1.01)	0.01	-0.94	0.35

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