Sampling bias and other methodological threats to the validity of health survey research
LC Johnson, R Beaton, S Murphy, K Pike - International Journal of Stress …, 2000 - Springer
Data from a longitudinal occupational health survey of professional fire fighters were used to
explore the potential impact of two types of methodological bias: sample selection and
reactivity. No significant differences on demographic variables were observed between the
group who first responded after a within-study change in survey administration format
(Delayed) and respondents who had completed surveys since the study's inception (Initial).
However, statistically significant differences in the study's 26 outcome measures provided …
explore the potential impact of two types of methodological bias: sample selection and
reactivity. No significant differences on demographic variables were observed between the
group who first responded after a within-study change in survey administration format
(Delayed) and respondents who had completed surveys since the study's inception (Initial).
However, statistically significant differences in the study's 26 outcome measures provided …
