When you have a PPO, you go to the doctor because you don't pay for the entire visit. The reason 8.8-percent more use preventive care is because that is the only time a doctor's visit is covered under the consumer-driven plan (unless you meet the $5,000 deductible for a family); therefore if you need medication refilled or anything, then you go to your well visit.
The consumer-driven plan may cut costs now. In the future, the person that is fighting an ache or pain waits because they don't want to pay the $80 out of pocket to go to the doctor. Two years later, they go and find out they have something seriously wrong; that is when it will start costing the consumer-driven plans more money. They are too new to have accurate data.
On the other hand, this could be the answer for national health care; maybe Congress should look at it.