The period after 1998 does not offer an exact comparison, but the period between 1986 and 1998 offers a very good comparison.

The different programme categories of the 1980s prevent exact comparison.

It's hard to make exact comparisons from one era to another.

Clearly an exact comparison between behaviors in -real and virtual domains cannot be assumed.

However, marathon routes still vary greatly in elevation, course, and surface, making exact comparisons impossible.

The new tests preclude exact comparisons with last summer's performance, but this year's results are nonetheless encouraging.

She wasn't sure if that were the exact comparison, but that was the way it felt.

Companies design their products in different ways, making exact comparisons difficult.

Lack of statistics from Communist times makes exact comparisons difficult, the report found.

It is impossible to make an exact comparison of such regulations and an agreement between companies: indeed, different provisions of the Treaty are applied.