Rivka Galchen documents the reluctance of politicians and people in the oil industry to acknowledge that deep-well-fluid disposal is a near-certain cause of the recent order-of-magnitude increase in seismicity in Oklahoma's oil-producing districts ("Weather Underground," April 13th).
Let us define mortality ratio (MR) for a certain cause of death as the ratio of the number of these deaths during the whole LSS period 1950-2003 thethe number of persons entering LSS.
Therefore, a change in significance of a certain cause of death results from the combined effects of a change in cause i and changes in causes other than i.
We cannot exclude the possibility, however, that the severity of certain causes of subfertility in the IVF group was not the same as in the non-IVF group.
One way to assess the contribution of a set of inputs to remaining life expectancy at age 60 (LE 60) and variability of age at death (VAD) is by eliminating certain causes of death from the data (see [17, 16], but also [21], and [22]).
Based on the theory of competing risks and the recommendations generated from previous research studies, we selected PGLE, which eliminates certain causes of death as the indicator of their impact on life expectancy.
In this second scenario, the missing charts might be related to certain causes of death that call into question the competency, staffing and medical resources available within the facility.
Furthermore, certain causes of visual impairment during childhood are a cause of later life blindness [ 20].
Yesterday, CNN said it was not certain of the cause of the problem.
He said that his government was not certain about the cause of the crash.
