Table 1.

The IRs of thyrotoxicosis in children <16 years of age in central Sweden in the 1990s compared with the 2000s

IRs per 100,000 person−years	1990–1999	2000–2009	p value
Total population	1.6 (1.2–2.2)	2.8 (2.2–3.6)	0.006
Girls	2.9 (2.1–4.0)	4.5 (3.4–5.9)	0.041
Boys	0.4 (0.2–1.0)	1.2 (0.7–2.0)	0.038

The values in parentheses are the 95% CIs.

IR, incidence rate.