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Table 1 Medical research council sum score: six-point and four-point ordinal scales for assessment

From: A new two-tier strength assessment approach to the diagnosis of weakness in intensive care: an observational study

Six-point ordinal scale Four-point ordinal scale
0 = no muscle contraction 0 = paralysis
1 = flicker or trace of muscle contraction 1 = severe weakness defined as >50% loss of strength
2 = active movement with gravity eliminated  
3 = reduced power but active movement against gravity 2 = slight weakness <50% loss of strength
4 = reduced power but active movement against gravity and resistance
5 = normal power against full resistance 3 = normal strength