Table 1.

Demographics of the study participants in the China BAPE Study 2018–2019 ($n=76$ with 353 measurements).

Variables	$n$ (%) or $\text{mean}\pm \text{SD}$
Age (y)	$65.1\pm 2.8$
Sex (male)	38 (50.0)
BMI (${\mathrm{kg}/\mathrm{m}}^2$)	$25.0\pm 2.4$
Highest education level
Primary school or below	8 (10.5)
Junior middle or high school	54 (71.1)
College graduate or beyond	14 (18.4)
Annual financial income ($\times \mathrm{10,000}$ CNY)
$\le 7$	25 (32.9)
7–10	26 (34.2)
$>10$	25 (32.9)
Tea consumption (number of cups/3 d)	$8.0\pm 10.4$
Alcohol consumption (frequency/3 d)	$0.02\pm 0.2$
Plasma cotinine concertation (ng/mL)	$1.0\pm 5.7$
Other diet (frequency/3 d)	$2.2\pm 2.6$
Month of sampling ($n$ samples)
September	66 (18.7)
October	74 (21.0)
November	71 (20.1)
December	71 (20.1)
January	71 (20.1)

Note: BAPE, Biomarkers of Air Pollutant Exposure; BMI, body mass index; SD, standard deviation.