Although the exact incidence of brain metastases is unclear, there appears to be an increasing incidence which has been attributed to longer survival, better control of systemic disease, and better imaging modalities.
A rising incidence, which is more plausible, would skew the S1/S2 ratio upwards, and result in an overestimation of r2, i.e. underestimated stage 2 duration.
Despite of the differences of surveyed population and criteria, many surveys on the prevalence of cough revealed a high incidence, which is commonly >10% (Table 1).
Overall, the triptans, apart from almotriptan 12.5 mg and the low dose of naratriptan, 2.5 mg [2], result in CNS adverse events with a relatively low incidence which indicates an effect on the CNS.
Combined, this may result in an overestimate of incidence, which may rise to as much as 10% in the later years of the epidemic.
Injury rate is a measure of incidence which facilitates scientific comparisons of the effect of various factors, such as playing position or injury history.
Class III malocclusion has a relatively low incidence which varies with race: 1% to 5% among Caucasians[1 3] (5% among Italian people)[4], 14% in Asians, and 5%to8%8% among black people[5].
In the 'no-change' simulation (1.0 on the horizontal axis) the BED test falsely indicates a reduction in incidence, which is generated by the shifting distribution in time since infection among the infected population.
Huai'an city lies downstream of Huaihe Downriver River and has a higher cancer incidence which has been taken into account [ 4, 5].
