Table 4 Annual time trend of incidence of subarachnoid haemorrhage in the reference region*.
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.