The latest study controlled for the effects of genetics by studying consecutive pregnancies among more than half a million women.
And a study at the Institute of Neurology, London, looked at seizures on cloudy and non-cloudy nights during a full moon, which controlled for the effects of light.
PD controlled for the effects of having a distressing non-headache, SNS disorder.
MCH controlled for the effects of having a distressing non-migraine/non SNS headache disorder.
Nevertheless, we statistically controlled for the effects of gender, since our sample size was not large.
We controlled for the effects of gender, age, presence vs absence of current BD episode and chronic depressive or (hypo manic symptoms (depending on the independent variable).
Furthermore, another study which controlled for the effects of smoking, gender, alcohol use and analgesic intake in this association found no indication that the higher prevalence of dyspepsia among migraineurs was induced or modified by analgesic intake [26].
As an additional exercise we controlled for the effects of turbulence in financial markets over the crisis period by shortening the sample period by three years, so that the samples all begin in 2009.
We controlled for the effects of other maternal risk factors, such as age, parity, history of preterm delivery, cigarette smoking, pre-pregnancy weight, diabetes mellitus (DM), renal dysfunction, and current use of an antihypertensive agent or prednisone.
Similarly, although this study controlled for the effects of SES, the duration of maternity leaves in the U.S. is highly related to the ability to take unpaid time off, to be covered by FMLA policy, or to having an employer who offers paid maternity leave.
Self-reported pretreatment substance use and criminal behaviors were compared with these behaviors 6 and 12 months following treatment entry using a General Linear Mixed Model analytic approach that controlled for the effects of potential confounding variables and examined individual and program factors that might explain treatment response.
