Total hours of sunshine and tuberculosis notifications.


<p>Note.– The thin black line above is the tuberculosis incidence per season. The tuberculosis incidence has been decomposed into a trend component (the thick blue line above) and a stochastic seasonal component (the thick red line across the middle of the graph). The thick black line below is the total hours of sunshine per season shifted two seasons (six months) to the right. Thin vertical interrupted lines mark the winter troughs in hours of sunlight. The graph shows that troughs in the total hours of sunshine per season correlate with peaks in the number of tuberculosis notifications two seasons later.</p

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