31.   Direct comparisons between the two years can not be made because different reporting methods were used, making it difficult to pinpoint the reasons for the change.

32.   Dole declined to make a direct comparison of his World War II experience with how Clinton avoided the war of his generation.

33.   Federal health officials sometimes pay for direct comparisons of drugs.

34.   However, different methods were used to note the changes in incidence of AIDS-related cancers, making direct comparisons of the findings difficult.

35.   However, direct comparisons with younger people may be beside the point.

36.   In particular, a direct comparison of maternal genomes with those of gay sons will help.

37.   It also will give racing fans in Texas a chance to make a direct comparison between the leagues.

38.   It also led to early, direct comparisons to Giuliani, who remains popular.

39.   Its absence prevented any direct comparison between Dolly and her donor, in particular the decisive test of a skin graft from one to the other.

40.   Observation systems have changed many times in the last century, adding uncertainty to the direct comparison of weather records.