Blood Harmane Concentrations in 497 Individuals Relative to Coffee, Cigarettes, and Food Consumption on the Morning of Testing

Table 2

Log blood harmane concentration and coffee consumption in analyses stratified by case-control status.

	ET cases (𝑁=242)	Controls (𝑁=255)
Log blood harmane concentration (g^−10/ml)
Drank coffee on morning of phlebotomy	0.42±0.54 [0.34]	0.37±0.62 [0.28]
Did not drink coffee	0.56±0.57 [0.42]	0.40±0.65 [0.26]
	𝑃=.11^a	𝑃=.69^a
Correlation between the number of cups of coffee on morning of phlebotomy and log blood harmane concentration	𝑟=−0.012, 𝑃=.068	𝑟=−0.002, 𝑃=.97
Correlation between the number of cups of coffee on morning of phlebotomy and log blood harmane concentration (in 214 participants who drank coffee on the morning of phlebotomy)	𝑟=−0.014, 𝑃=.23	𝑟=0.078, 𝑃=.38

^aMann Whitney test. In upper row, values are means ± standard deviation (median). Correlation coefficients, r, are Spearman’s rho.