Around the nation, blood supplies are also down, though the need varies by region.

That's actually a hard question to answer, because individual needs vary widely.

The needs vary for each child with a disability but include education and related services.

The need to protect the young usually varies with the number of offspring at one birth.

But individual needs vary, for example depending on age and diet.

The region's musical needs vary greatly from one town to the next.

Children's nutritional needs vary depending on their age and activity level.

Perhaps in more than any other age category, the needs of the elderly vary.

But the need for these and other tests varies in each case.

And just like every area varies in different ways, medical needs of the population vary.