. Author manuscript; available in PMC: 2014 May 27.

Published in final edited form as: JAMA Neurol. 2013 Oct;70(10):1277–1287. doi: 10.1001/jamaneurol.2013.3861

Table 1.

Demographic Information and Cerebrospinal Fluid Hemoglobin Levels.

Characteristic	HCs (n = 39)	PD (n = 63)	P Value
Age, mean (SD) [95% CI], y	58 (13) [54–63]	62 (10) [59–64]	.24^a
Female/male, No. (%male)	18/21 (53.8)	24/39 (61.9)	.42^b
Education, mean (SD) [95% CI], y	16.8 (2.4) [16.0–17.6]	16.4 (2.5) [15.8–17.0]	.15^a
Age at diagnosis, mean (SD) [95% CI], y	…	61.1 (10.0) [58.6–63.7]	…
Disease duration, median (range), y	…	0.4 (0.0–2.6)	…
Subjects with CSF Hb > 200 mg/mL, No.	6	18	.13^b
CSF total protein, mean (SD) [95% CI], mg/dL	40 (12) [36–43]	46 (21) [40–51]	.32^b

Abbreviations: CSF, cerebrospinal fluid; Hb, hemoglobin; HCs, healthy controls; PD, Parkinson disease; ellipses, not applicable.

Based on Mann-Whitney U test.

Based on χ² text.