Table 1.

Incidence rate ratios of Puumala virus infections by regional state over the three time periods, Finland, 1995–2014

Time period*	Southern Finland	Southwestern Finland	Western & Inland Finland	Eastern Finland	Northern Finland	Lapland
First	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.
Second	1·6 (1·5–1·8)	3·8 (3·2–4·5)	1·9 (1·8–2·1)	1·6 (1·5–1·7)	1·4 (1·3–1·5)	1·7 (1·5–1·9)
Third	2·0 (1·9–2·1)	3·3 (2·8–4·0)	1·8 (1·7–1–9)	1·7 (1·6–1·8)	1·1 (1·0–1·2)	0·8 (0·7–0·9)

Values given are incidence rate ratio (95% credible interval).

* First period (1 April 1995 to 31 March 2001); Second period (1 April 2001 to 31 March 2007); Third period (1 April 2007 to 31 March 2014).