40 Chapter 2 Item Item number STROBE recommendation Pag STROBE-AMS new items Pag Variables 7 Clearly define all outcomes, exposures, predictors, potential confounders and effect modifiers. Give diagnostic criteria, if applicable 7.1 Specify antimicrobial usage according to: type, dosage, duration and route of administration 7.2 Provide information using defined daily dosages (DDDs) and, in addition, other definitions closer to local reality (packages, prescriptions). Provide justification for the measurement presented 7.3 Address antimicrobial combinations 7.4 Explain rationale for grouping of antimicrobials 7.5 Define time at risk for antimicrobial exposure and for resistance development 7.6 Include description of potential confounders (other than epidemiological variables) 7.7 Provide definition of resistance, multidrug resistance, including pattern of co-resistance; whether studies performed to identify location or resistance eg, plasmid, chromosome, integrin, transposon 7.8 Definition of infection and/ or colonisation. If not a validated reference, provide evidence of robustness of the new definition 5-7 Data sources/ measurement 8 For each variable of interest, give sources of data and details of methods of assessment (measurement). Describe comparability of assessment methods if there is more than one group 8.1 Describe how antimicrobial consumption data were obtained (pharmacy, patients’ charts, etc) and if it was actually used or purchased/dispensed 5-7 Quantitative variables 11 Explain how quantitative variables were handled in the analyses. If applicable, describe which groupings were chosen, and why 11.1 Provide subgroup analyses for immunocompromised, surgical/ medical patients and patients in intensive care units, if applicable 5-7 Results Descriptive data 14 (a) Give characteristics of study participants (eg, demographic, clinical, social) and information on exposures and potential confounders 14.1 Specify among the exposure: previous stay in long-term care facilities, nursing home and other healthcare settings 8-9
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