A key point that was left out (the first line of the article, actually):
QUOTE
Those who make a public pledge to abstain until marriage delay sex, have fewer sex partners and get married earlier, according to the data, gathered from adolescents ages 12 to 18 who were questioned again six years later. But the two groups' STD rates were statistically similar.
So pledgers have sex less, but when they do they have more unprotected sex. You almost imply that taking a pledge puts the pledger at greater risk for STDs. Instead, the two balance out (as far as STD rates go).
The rates are statistically similar, but not the same:
QUOTE
The study found that the STD rates for whites who pledged virginity was 2.8 percent compared with 3.5 percent for those who didn't pledge. For blacks, it was 18.1 percent and 20.3 percent. For Asians, 10.5 percent of virginity pledgers had STDs compared with 5.6 percent of non-pledgers. For Hispanics, it was 6.7 percent and 8.6 percent.
Only among one race of pledgers was the rate of STDs higher for pledgers.
Then you have statements such as:
QUOTE
The study also found that in communities where at least 20 percent of adolescents pledged the STD rates for everyone combined was 8.9 percent. In communities with less than 7 percent pledgers, the STD rate was 5.5 percent.
This really tells us little without a context (which is true of all statistics, of course). Which communities have this unusually high percentage of pledgers? What are the numbers for the middle (probably majority) group?
I am not doubting the numbers, I am doubting the conclusions drawn and the manner in which the numbers are presented.