The two eligible studies for this review provide moderate evidence that saddle seats provided lower ergonomic risk than conventional seats in the examined population of dental students
OBJECTIVE This study aim ed to verify whether the saddle seat provides lower ergonomic risk than conventional seats in dentistry .
Work factors as predictors of intense or disabling low back pain; a prospective study of nurses’ aides
Aims : To identify the work factors that predict  intense low back pain ( LBP ) and LBP related sick leaves in nurses ’ aides . Methods : The sample comprised 4266 r and omly selected Norwegian nurses ’ aides , not bothered or only a little bothered by LBP during the previous three months , and not on sick leave when completing a mailed question naire in 1999 . Of these , 3808 ( 89.3 % ) completed a second question naire 3 months later and 3651 ( 85.6 % ) completed a third question naire 15 months later . Intensity of low back symptoms and certified sick leaves attributed to LBP during the observation period were assessed by self reports at the follow ups . Results : After adjustments for LBP during the three months prior to baseline , baseline health complaints , demographic and familial factors , and a series of physical , psychological , and social work factors , logistic regression analyses revealed the following associations : intense low back symptoms were predicted by frequent positioning of patients in bed , perceived lack of support from immediate superior , and perceived lack of pleasant and relaxing culture in the work unit . LBP related sick leaves were predicted by frequent h and ling of heavy objects , medium level of work dem and s , perceived lack of supportive and encouraging culture in the work unit , working night shifts , and working in a nursing home . Long term LBP related sick leaves were associated with changes of work or work tasks during the observation period that result ed in a perceived reduction of support and encouragement at work . Conclusions : Not only frequent mechanical exposures , but also organisational , psychological , and social work factors , such as night shift work , perceived lack of support from superior , and perceived lack of a pleasant and relaxing or supporting and encouraging culture in the work unit , are associated with an increased risk of intense low back symptoms and LBP related sick leaves in nurses ’ aides
The two eligible studies for this review provide moderate evidence that saddle seats provided lower ergonomic risk than conventional seats in the examined population of dental students
OBJECTIVE This study aim ed to verify whether the saddle seat provides lower ergonomic risk than conventional seats in dentistry .