BobG
Science Advisor
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SpaceTiger said:Don't you think there might be a correlation between the state feeling the need for a seat belt law and the drivers feeling the need for a seat belt? Virtually all states show an increase in seat belt use with time, regardless of the status of the state's laws. This implies that culture and media play a big role. Notice also that the states which implemented laws during the displayed timespan always registered an increase in use after implementation, but at a rate comparable to the increases of previous years. Finally, notice that both seat belt use seat belt laws seem to be more common in the more urbanized states. Not a surprise, I should think. If I lived in Montana, I would probably feel less of a need to wear a seat belt.
Do I think the laws make any difference? Yeah, probably, but these stats suggest that it's not a big effect. I would be surprised if it had a noticable effect on hospital crowding or the rates of job abandonment by nursing spouses.
One example where the laws reflect trends that already exist vs the laws causing the change: tobacco bans and tobaco use. (Not a direct example, but tobacco data and bans are easier to get and compile)
22 states have restrictive state wide bans to include most bars (kind of the criteria I used as restrictive, since bars, casinos, and bowling alleys are the most often exempted).
Based on 2004 & 2005 statistics, 8 of the 10 states with the lowest smoking rates have enacted bans - 7 of the bans were enacted in 2004 or later, with 5 enacted 2006 or later. I think it's safe to say the 5 bans in 2006 or later didn't reduce smoking in 2004 and 2005.
12 of the 14 lowest states enacted smoking bans, with 7 of the bans enacted in 2006 or later and 10 of the bans enacted in 2004 or later.
3 of the 17 states with the highest smoking rates have statewide smoking bans, all enacted in Oct 2005 or later.
http://www.oas.samhsa.gov/2k5state/AppB.htm#TabB.13 (You have to go all the way down to table B.13 and import into a spreadsheet if you want to sort the data)
http://en.wikipedia.org/wiki/List_of_smoking_bans_in_the_United_States
The states where smoking is highest have the least support for smoking bans and they're not passed. The states where smoking is lowest have more support for bans and they are passed.
It's perfectly reasonable to believe trends in seatbelt usage affect seatbelt laws as to believe seatbelt laws affect trends in seatbelt usage. To show the laws have an effect, there needs to be before and after statistics - (something hard to get for tobacco bans unless you live in California, Maine, or Delaware, which have had bans for quite some time)
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