61.   But a review of all the cases years later found higher mortality rates among the men and women with abnormal or inconclusive results.

62.   But adjusting mortality rates for the risk of patients is devilishly difficult.

63.   But despite these reductions of deaths from self-induced abortions, the pregnancy-related mortality rate remains startlingly high.

64.   But declining mortality rates do not tell the whole story.

65.   But even when long-running series grow weary, they often do better in the ratings than new shows, which have increasingly high mortality rates.

66.   But Dr. Charles Marrin, cardiac surgeon and associate professor of surgery at Dartmouth Medical School, doubts the average consumer could understand the statistics behind the mortality rates.

67.   But infant mortality rates have continued to decline.

68.   But mortality rates for men in the lowest civil service classification, the researchers found, were three times higher than those for men in the highest grade.

69.   But overall mortality rates of both sets of caterpillars were similar.

70.   But the breast cancer mortality rate continues to show a racial disparity.