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Table 1 Classification scheme for grading evidence [6]

From: Multiple trauma management in mountain environments - a scoping review

Grade 1A Strong recommendation, high quality evidence, benefits clearly outweigh risks and burden or vice versa
Grade 1B Strong recommendation, moderate-quality evidence, benefits clearly outweigh risks and burdens or vice versa
Grade 1C Strong recommendation, low-quality or very low-quality evidence, benefits clearly outweigh risks and burdens or vice versa
Grade 2A Weak recommendation, high-quality evidence, benefits closely balanced with risks and burdens
Grade 2B Weak recommendation, moderate-quality evidence, benefits closely balanced with risks and burdens
Grade 2C Weak recommendation, low-quality or very low-quality evidence, uncertainty in the estimates of benefits, risks and burden; benefits, risk and burden may be closely balanced