11.   Polar bear cubs that are pushed out of dens too early have higher mortality rates.

12.   Researchers attributed the higher mortality to poor health care and supervision in community settings.

13.   Rural communities have a higher infant mortality rate, a higher adolescent pregnancy rate and a higher number of people living below poverty, he pointed out.

14.   That means when extracted, the fish have a higher mortality rate.

15.   The Atlanta-based CDC also was behind a recent study that stated NFL players do not have higher mortality rates than non-league players.

16.   The higher mortality rates are mainly due to recurrences of the original cancer, treatment-induced cancers and treatment-induced heart diseases.

17.   To explain the correlation between depression and higher mortality rates, Mayne assumed that behavioral changes in people with AIDS were the likeliest explanation.

18.   Overall, southern states registered higher on the index, and had correspondingly higher mortality rates.

19.   A protracted economic decline has left millions impoverished, pushing down birth rates and worsening the national health care system, contributing to higher mortality rates.

20.   A protracted economic decline has left millions impoverished, pushing down birth rates and worsening the national health care system, which caused higher mortality rates.