However, to allow for possible confounding variables and investigate the possibility that the relative effects of manual therapy versus active rehabilitation differ according to LH score, each post-treatment outcome was regressed on treatment group, the corresponding baseline measure, gender, employment, LH (high or low), age, chronicity and the interaction between LH and type of treatment.
Studies were evaluated for their attempts at matching their study samples and adjusting for possible confounding variables.
This group of studies used better quality design with more clearly defined outcome measures, and most of the studies have allowed for possible confounding variables.
The researchers controlled for possible confounding variables influencing their data, such as the fact that people who live at higher latitudes are physically bigger and the possibility that the size of a person's eye socket in colder climates might be bigger to allow for a thicker layer of insulating fat.
This was despite nearly identical power outputs in all four tests and efforts to control for possible confounding variables, such as the time of day.The athletes may be rewarding themselves for their collaboration.
Nonetheless, these differences remained significant after multivariate analysis for possible confounding variables.
Linear and logistic regression analyses were performed to adjust for possible confounding variables.
In addition, we performed a multivariate Cox proportional-hazards regression model to adjust for possible confounding variables that might have an effect on the risk of depressive, anxiety, and sleep disorders.
Correction for possible confounding variables including preoperative PVR, duration of retinal detachment, and macular involvement was necessary due to small differences in baseline characteristics between the PVR group and the RRD group.
No further adjustment was done for possible confounding variables.
Three two-step logistic regression analyses were performed to control for possible, confounding variables.
