Sentence examples for makes comparison difficult from inspiring English sources

Different testing organizations also used different time-lengths in measuring the chemicals' effect on rodents, in some cases 18 months, in others 24 months, which makes comparison difficult.

Second, the diversity of organizations makes comparison difficult: how could we possibly compare the work of the University of Chicago to a homeless shelter in Albuquerque or to Greenpeace?

Also, the absence of a clinically diagnosable group with DSM-IV or ICD-10 stress pathology makes comparison difficult in order for the modified version of the TSI to show evidence of its discriminative ability.

Over the years, the incidence of right ventricular dysfunction (RVD) has declined as improvements in mechanical ventilation have been adopted and lessened the intrathoracic airway pressure in patients with ARDS [17],[19], but RVD is variably defined and diagnosed among studies which makes comparison difficult.

This makes comparison difficult.

The classification of AEs in earlier studies was not uniform, which makes comparison difficult.

Heterogeneity of study designs and definitions makes comparisons difficult.

Continual revision of Ofsted's frameworks makes comparisons difficult and judgments inconsistent, she says.

Other colleges and universities, however, have chosen different targets, which makes comparisons difficult.

There is much variation in the design of antifeedant tests between laboratories, which often makes comparisons difficult.

A range of health-related quality-of-life instruments were used in the studies, which makes comparisons difficult.