Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
| No of studies | Incidence ratio† (95% CI) | Incidence ratio† (95% CI) adjusted for gender and age | |
|---|---|---|---|
| Reference region | 42 | 1.001 (0.997 to 1.004) | 0.994 (0.987 to 1.001) |
| Reference region after 1990 | 24 | 0.973 (0.961 to 0.985) | 0.994 (0.967 to 1.022) |
*All countries other than Japan, Finland and South and Central America.
†Incidence ratio represents coefficient for year‐to‐year annual change.
