With steroid use, an increase in appetite and food intake may contribute to weight gain.

The increase of the number of users will contribute to the interference level.

Natural increase also contributes to the increase in population.

"The increase in retirement housing units has also contributed to the smaller overall household size," the study said.

Such increases could contribute to an economic slowdown by leaving people with less money to spend over the holiday season.

The pace of legislative change and the increase in the population dependent on benefits have contributed to this.

The increase in tax rates contributed to an economic slowdown.

Recent increases to the tax burden on foreign businesses manufacturing in China are also contributing to mounting costs.

And an increase in spending at all levels of government contributed to the rising economy.

The proposition that the increase in single parenthood has contributed to family poverty is supported by a variety of studies.