Demographics information in NPRBD and PRBD groups with serum collected.

<p>*: P<0.05.</p><p>Demographics information in NPRBD and PRBD groups with serum collected.</p

The levels of inflammatory factors in serum among control, NPRBD and PRBD groups.

<p>P¹: NPRBD group vs. Control group;</p><p>P²: PRBD group vs. Control group,</p><p>P³: PRBD group vs. NPRBD group.</p><p>^<b>#</b>: P<0.017.</p><p>The levels of inflammatory factors in serum among control, NPRBD and PRBD groups.</p

The levels of iron and related proteins in CSF among control, NPRBD and PRBD groups.

<p>P¹: NPRBD group vs. Control group; P²: PRBD group vs. Control group, P³: PRBD group vs. NPRBD group.</p><p>**: P<0.01.</p><p>^<b>#</b>: P<0.017.</p><p>The levels of iron and related proteins in CSF among control, NPRBD and PRBD groups.</p

The levels of iron and related proteins in serum among control, NPRBD and PRBD groups.

<p>P¹: NPRBD group vs. Control group;</p><p>P²: PRBD vs. Control group,</p><p>P³: PRBD group vs. NPRBD group.</p><p>^<b>#</b>: P<0.017.</p><p>The levels of iron and related proteins in serum among control, NPRBD and PRBD groups.</p

Demographics information and numbers of non-motor symptoms in NPRBD and PRBD groups.

<p>*: P<0.05,</p><p>**: P<0.01.</p><p>Demographics information and numbers of non-motor symptoms in NPRBD and PRBD groups.</p

The levels of inflammatory factors in CSF among control, NPRBD and PRBD groups.

<p>P¹: NPRBD group vs. Control group; P²: PRBD group vs. Control group, P³: PRBD group vs. NPRBD group.</p><p>**: P<0.01.</p><p>^<b>#</b>: P<0.017.</p><p>The levels of inflammatory factors in CSF among control, NPRBD and PRBD groups.</p