Table 4. Short-term effects of influenza dynamics on pneumococcal risk using multivariable negative binomial regression analysis.

Negative Binomial Regression Analysis	Incidence Rate Ratio	95% Confidence Interval	p-Value
Influenza A and B (combined, per 100 infections), 1-wk lag	1.092	1.047–1.138	<0.001
Influenza A and B (combined, per 100 infections), 3-wk lag	0.932	0.890–0.976	0.003
UVI average, 1-wk lag	0.927	0.893–0.963	<0.001
UVI average, 3-wk lag	0.946	0.917–0.976	<0.001
Relative humidity, 1-wk lag (%)	0.995	0.991–1.000	0.03
Mean temperature, 2-wk lag (°C)	0.993	0.984–1.002	0.14
Mean temperature, 4-wk lag (°C)	1.004	0.995–1.012	0.39

Model is also adjusted for year and seasonal oscillation.

UVI, clear-sky UV-index.