The effectiveness of pore strips varies on an individual basis.

Air temperature varies on a daily and seasonal basis.

However, their use may have varied - especially on a regional basis.

Rain also can vary on a local basis.

Distribution rights in the United States vary on an individual basis.

Officially this custom does not continue, although the practice can vary on a school-to-school basis.

The amount of time it takes to see effects varies on an individual basis.

The temperature varies a great deal, both on a daily and on a seasonal basis.

The composition of the calls to 311 vary on a monthly basis due to weather.

Regulations for equipment and use vary widely on a state-by-state basis.