The repeatability and validity of questionnaires assessing occupational physical activity – a systematic review

Social support modifies association between forward bending of the trunk and low-back pain: Cross-sectional field study of blue-collar workers

“…Since these aspects can affect the association between forward bending and LBP, we included self-reports of occupational lift burden as confounding variables in the analyses. Factors like muscle pain tend to bias self-reported measures of physical work demands (16,17), since workers having pain can overestimate the physical exposures, thus leading to erroneous interpretations of associations between physical exposure and pain (23). However, obtaining valid diurnal objective measures of lifting and pulling for several consecutive days in a cohort of this size is, to the authors' knowledge, not yet feasible, leaving only self-reported measures available.…”

“…One reason for the conflicting results can be differences in methodology used to measure forward bending of the trunk (15). The majority of studies investigating the association between forward bending of the trunk and LBP (11) have been criticized for using self-reported measures (16,17) or the short window of observations (18)(19)(20)(21). Therefore, valid objective measurements using accelerometers are preferable due to higher precision (22) and possibility for longer measurement periods (23).…”

Prolonged sitting at work is associated with a favorable time course of low-back pain among blue-collar workers: a prospective study in the DPhacto cohort

“…However, previous reviews, mainly using self-reported duration of sitting, have not established significant associations between duration of sitting and LBP (12)(13)(14). However, duration of sitting measured mainly by self-reports, like questionnaires, has been shown to be both biased and imprecise when compared to objective measurements (15)(16)(17). Studies using objective measures of the total and temporal patterns of sitting durations in relation to time course of LBP also show mixed findings (17)(18)(19).…”

Dose–response relation between perceived physical exertion during healthcare work and risk of long-term sickness absence

“…However, there are similar valid questions about physical exposure at work relating to the question used in the present study (22,23).…”