. Author manuscript; available in PMC: 2019 Dec 3.

Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2018 Apr 27;27(7):814–821. doi: 10.1158/1055-9965.EPI-18-0184

Table 3.

Association of β-diversity with coffee and tea intake as categorical or continuous variables.

	Categorical					Continuous
	P^a				P-trend^a,b	P^a
	None	<1 c/day	[1-3) c/day	≥3 c/day		Per cup per day
Coffee	Ref.	0.68	0.69	0.49	0.43	0.90
Tea	Ref.	0.75	0.12	0.02	0.003	0.002

P-values from PERMANOVA of weighted UniFrac distance, adjusting for age, sex, study (CPS-IIa, CPS-IIb, PLCOa, PLCOb), current smoking, BMI (kg/m²), energy intake (kcal/day), ethanol intake (grams/day), and coffee or tea intake (cups/day; in tea and coffee models, respectively).

Trend tests across groups were done by entering the categorical variables into the models as continuous terms.