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, Collective. social and personal services 3

, Activities of households as

, All non-missing sectors 59 76

, Results are presented and rate are calculated when there are at least five cases for at least one study (Agriculture, hunting and forestry, Electricity, gas and water conditioning supply, Construction, Accommodation and food service activities, Transportation and communication, Education and Activities of households as employers are not presented in table a; Fishing, aquaculture and related service, Mining and quarrying and Activities of extraterritorial organizations and bodies are not presented in tables a and b); b Concerning the Cosali study and the UWRD surveillance, the prevalence rate was calculated using the number of cases of chronic LBP and DRS as numerator and the whole salaried staff included in each system as denominator (Table I) For the LDS study and the OD-DRS, the incidence rate was computed using the number of DRS cases in each system as numerator and the number of employed people according to INSEE census of 2007; c 95% confidence interval; d Prevention index, a Industry sectors coded using the 17 sections of the French version of the statistical classification of economic activities in the European Community bold, the first three sectors in terms of PI for each study and indicator, 2003.