Risk factors for occurrence

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Individual risk factors

Although results of epidemiological studies are not necessarily consistent, factors that have been reported to be associated with low back pain are age, physical fitness, and strength of back and abdominal muscles. There seems to be no association between low back pain and other individual factors such as gender, length, weight, Body Mass Index, flexibility/mobility and structural deformities of the spine.

Recent systematic reviews found that smoking and body weight should be considered weak risk indicators and not causes of low back pain [13, 14], and

Table 7.1 Risk factors for occurrence and chronicity

Occurrence

Chronicity

Individual factors

Psychosocial factors

Occupational factors

Physical fitness

Strength of back and abdominal muscles

Smoking

Stress

Anxiety

Mood/emotions Cognitive functioning Pain behavior

Manual material handling Bending and twisting Whole-body vibration Job dissatisfaction Monotonous tasks Work relations/social support Control

Obesity

Low educational level

High levels of pain and disability

Distress

Depressive mood Somatization

Job dissatisfaction

Unavailability of light duties on return to work Job requirement of lifting for % of the day that alcohol consumption [68], standing or walking, sitting, sports, and total leisure-time physical activity [15] do not seem to be associated with low back pain.

Psychosocial risk factors

Psychosocial factors that traditionally have been reported to be associated with low back pain are anxiety, depression, emotional instability, and alcohol or drug abuse [16]. A recent systematic review of observational studies of psychosocial factors for the occurrence of back pain found insufficient evidence for an effect of psychosocial factors in private life, such as family support, presence of a close friend or neighbor, social contact, social participation, instrumental support and emotional support [17].

A prospective cohort study provided evidence that psychologic distress at 23 years of age more than doubled the risk of low back pain onset 10 years later, while other factors (e.g. social class, childhood emotional status, Body Mass Index, job satisfaction) did not increase the risk [18]. Another systematic review found a clear link between psychologic variables and low back pain [19]. Psychologic variables that are associated with low back pain are stress, distress or anxiety as well as mood and emotions, cognitive functioning, and pain behavior.

Occupational risk factors

Occupational factors such as physically heavy work, lifting, bending, twisting, pulling and pushing (or the combination of these last three with lifting), and vibrations have often been associated with low back pain [20].

A systematic review of aspects of physical load found strong evidence that manual materials handling, bending and twisting, and whole-body vibration are risk factors for back pain [17]. Two systematic reviews of psychologic workplace variables in back pain found strong evidence that job dissatisfaction, monotonous tasks, work relations, social support in the workplace, demands, stress, and perceived ability to work were associated with the occurrence of low back pain [17, 21]. Moderate evidence was found for work pace, control, emotional effort at work, and the belief that work is dangerous, and insufficient evidence was found for a high work pace, high qualitative demands [21], low job content and low job control [17].

Studies on the association between occupational risk factors and low back pain are hampered by the difficulties of measuring exposure to specific factors. Exposure to specific risk factors may vary among employees with the same job, but also the task they perform may vary. Also, the "healthy worker effect" may considerably affect results of epidemiologic studies in occupational settings. That is, healthy workers may stay on the same job or perform the same task for years, while workers with low back pain may have moved to another job or function or their tasks may have been adjusted.

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