Studies of vocational education, however, found no effects on sexual risk-taking or pregnancy among teenagers.
But they came across no such benign competitive effects—indeed, they found no effects at all.
And a few small studies of pregnant women who deliberately exercised to raise their body temperature also found no effects on the babies.
A meta-analysis of these studies found no effects for the eye movements (Davidson and Parker, 2001).
The researchers shrugged and called for further study to elucidate, but many of the subsequent studies found no effects from writing at all.
The study in the Philippines also measured the probability of being under the poverty line and the quality of food that people ate, and again found no effects.
Of the 29 experimental studies that examined the effectiveness of contraception-based sex education programs in delaying sexual intercourse, promoting the use of contraception and preventing pregnancy and the spread of sexually transmitted diseases, some found positive effects, some found no effects and some even found negative effects.
Another RCT found no effects of tai chi on locomotor ability compared with qigong.
We found no effects of the historical landscape configuration on the genetic diversity of the populations.
We found no effects, however, of Internal HLC or educational capital on treatment uptake.
In contrast, we found no effects of female choice efficiency on offspring fitness.
