Detailed methods and previous results from the POLM trial have been thoroughly described in previous reports.
The M2 database was searched for relevant LBP-related International Classification of Diseases (ICD) codes for Soldiers enrolled in the POLM trial using previously defined methods for operationally defining LBP using ICD codes.
For example, in a previous secondary analysis from the POLM trial, (7) responders to the web-based survey were more likely to be older, white, have higher levels of education and income, are less likely to smoke, and have lower body mass index compared to nonresponders.
The lessons learned in conducting the POLM trial gave us the opportunity to reflect on how the prevalence rates of LBP depend significantly on how of an incidence of LBP is defined (ie, patient reported vs having sought medical care, etc).
 Weiland, M., Daro, A., and David, C., 1995, "Biodegradation of thermally oxidized polyethylene," Polm. degrad.
 Chiellini, E., Corti, A., and swift, G., 2003, "Biodegradation of thermally oxidized, fragmented low density polyethylene," Polm. Degrad.
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