美国国家职业安全卫生研究所

[目的]探讨美国国家职业安全卫生研究所提出的手工作业提举指数（LI）与下背痛患病率的关系。

To investigate the correlation between the prevalence of low back pain and manual lifting stressors , measured with the lifting index ( LI ) of the revised lifting equation from the National Institute for Occupational Safety and Health ( NIOSH ) .

美国国家职业安全卫生研究所（NIOSH）主任约翰·霍华德（JohnHoward）也表示，这再次证实了我一贯的观点，即你对自己工作的控制感越强，你就越快乐。

The survey , adds John Howard , director of the National Institute for Occupational Safety and Health , 'reaffirms my view that the more control you have over your work , the happier you are . '

美国国家职业安全卫生研究所（NIOSH）主任约翰•霍华德（JohnHoward）也表示，这再次证实了我一贯的观点，即你对自己工作的控制感越强，你就越快乐。

The survey , adds John Howard , director of the National Institute for Occupational Safety and Health , ' reaffirms my view that the more control you have over your work , the happier you are . '