Table 1.

Participant Demographic Characteristics

Characteristic	Group 1	Group 2	All
No. of participants challenged	20	20	40
Sex, male	10 (50)	11 (55)	21 (52.5)
Age, y, median (range)	27 (19–49)	23 (20–50)	25 (19–50)
Ethnicity, white British	18 (90)	17 (85)	35 (88)
Country of birth, United Kingdom	15 (75)	17 (85)	32 (80)
Tobacco smoking ever, yes	9 (45)	8 (40)	17 (43)
Alcohol intake, units/wk, median (IQR)	4 (0–10)	7 (4–11)	5 (2–10)
BMI, kg/m2, mean ± SD	23.5 ± 3.2	22.8 ± 4.2	24.1 ± 3.8

Data are presented as No. (%) unless otherwise indicated.

Abbreviations: BMI, body mass index; IQR, interquartile range; SD, standard deviation.