Table I.2.2Modified CDC/HICPAC ranking system for evidence

CATEGORYCRITERIA
IAStrongly recommended for implementation and strongly supported by well-designed experimental, clinical, or epidemiological studies.
IBStrongly recommended for implementation and supported by some experimental, clinical, or epidemiological studies and a strong theoretical rationale.
ICRequired for implementation, as mandated by federal and/or state regulation or standard.
IISuggested for implementation and supported by suggestive clinical or epidemiological studies or a theoretical rationale or a consensus by a panel of experts.

From: 2, Guidelines’ preparation process

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WHO Guidelines on Hand Hygiene in Health Care: First Global Patient Safety Challenge Clean Care Is Safer Care.
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