Foam rolling technique requires individuals to use their bodyweight during rolling a specific body region over a dense foam cylinder; whereas during self massage using hand-held roller massager, upper body strength (rather than body weight) is employed to exert pressure on muscle tissue [ 15].
Weighting was employed to reduce potential nonresponse bias.
Post-stratification weighting was employed to adjust for differences in response rates by age, household size and region and produce unbiased estimates.
Back weighting was employed to provide a population estimate which takes into account the MRC CFAS sampling procedure and those who dropped out prior to the respective case finding interview.
Weights were employed to account for selection probabilities and correct for potential non-response biases, with post-stratification by age, sex, family size and geographic area.
A strength of this study is that the findings are based on a very large nationally representative dataset; weights were employed to adjust for study design and non-response.
Additional adjustment of the model by relevant clinical parameters [pre HDF systolic blood pressure (SBP), albumin, ultrafiltration rate, pre HDF body temperature, post HDF weight] was employed to exclude confounding of the results.
Because of these differences, a population weighting procedure was employed to adjust for resulting biases in the results.
