Only a few studies investigated participation rates, comparing participants provided with and without choice of mode, and using telephone interviews and postal questionnaires as participation modes of interest.
Potential predictors were age, gender, marital status, occupational grade, retirement, home ownership, presence of longstanding illness, SF-36 quality of life scores, social participation and educational level comparing participants and those who had withdrawn from the study.
The generalisability of a study should be assessed by comparing participants with the largest possible group of non-participating individuals.
The validation study consisted of a within-subjects study design comparing participants riding on-road with riding in the simulator.
It is concluded that RCPM can be used with confidence in studies comparing participants with and without intellectual disability.
By comparing participants' smartphone usage patterns and their motives for adopting or ignoring certain social media practices, the study illustrates how the concept of attitudinal vulnerability extends our understanding of Hofstede's theory of collectivism and individualism.
When comparing participants with the worst and best joint position sense, no significant differences in pain and disability could be found (p>0.05).
To examine the outcome of the recent implementation of a smoke-free policy in drugstores in Thailand, comparing participants and non-participants of the 100% smoke-free drugstore campaign promoted by the Thai Pharmacy Network for Tobacco Control TPNTCC).
We found significant differences (p = .01) in the mean driving safety knowledge scores when comparing participants in SOM-A (3.7, SD 2.0) to those in SOM-B (0.87, SD 2.6).
The average difference in QT interval duration comparing participants drinking ≥7 drinks/week to non-drinkers in fully adjusted models was 1.8 ms (−0.5 to 4.0) (Table 4).
However, the analysis comparing participants and non-participants did not show any difference in general cognition or sociodemographic characteristics (see Supporting Information Table S5).
