Comparison 1. Plasma exchange (PE) versus control.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Change in Neuropathy Disability Score	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only
2 Change in Neuropathy Disability Score (weakness)	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only
3 Change in vibration detection threshold	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only
4 Change in summed compound muscle action potential (CMAP) (mV)	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only
5 Change in summed motor nerve conduction velocity (m/s)	1		Mean Difference (IV, Fixed, 95% CI)	Subtotals only