The disorder is thought to be more common in males than females, by a factor of 6 to 1.

Iron horseshoes became common by the 13th or 14th century.

When pressed steel wheels became common by the 1940s, these were often painted the same color as the car body.

Gunpowder was introduced about 1700, and had become common by 1750.

Printing onto cloth had spread much earlier, and was common in Europe by 1300.

These are very rare in childhood but common by middle age.

Cannabis as a medicine became common throughout much of the Western world by the 19th century.

They are more common in women than in men, by a ratio of 3 to 2.

As a result, the sedentary merchant had become fairly common by 1300.

This procedure is quite common in competition policy, but by no means universal.