Table 2.

Time trend and seasonality of hip fracture incidence in two Spanish regions (2000–2008).

	Mediterranean area	Inland area
Tendency (per year)	1.004 (0.990–1.018)	1.015 (1.001–1.030)
Seasons
Spring (ref.)	1	1
Summer	0.963 (0.866–1.07)	1.032 (0.934–1.140)
Autumn	1.094 (0.991–1.208)	1.050 (0.951–1.160)
Winter	1.093 (0.989–1.207)	0.884 (0.792–0.986)

Results expressed as incidence rate ratio (95% confidence interval); ref.: reference category.