Although I �m not a native speaker, I think I can help. This is an abstract of a research paper, isn �t it?
The low back pain which is a common phenomenon among physiotherapists is caused by an overload due to professional work and lifestyle.
The aim of this research is to show the evaluation of low back pain frequency among physiotherapists and to see if there is any connection between the occupation and the frequency of pain problems.
This research is carried out on the basis of a survey which was done/carried out between March and June 2013. The participants in this study are 67 people working as physiotherapists.(Before you mention the results, you should talk about data collection.)
The analysis of the collected data shows that the pain syndrome of the low back pain occurs up to 82,1 % respondents(I �m not sure of this). The pain in L-S part of the spine escalates with the increase of the length of service. Most of the surveyed physiotherapists declared the knowledge of the low back pain prevention and the knowledge of the ergonomics with the patient.
In the light of these results, physiotherapists occupation involves the risk of low back pain.
BTW, if this is really an abstract, it should be written as one single paragraph.