Table 1. Characteristics of the Participants at Baseline.^*.

Characteristic	Age of 56–70 Years		Age of ≥71 Years		All Participants (N=40)
	25-μg Dose (N=10)	100-μg Dose (N=10)	25-μg Dose (N=10)	100-μg Dose (N=10)
Sex — no. (%)
Male	3 (30)	5 (50)	8 (80)	3 (30)	19 (48)
Female	7 (70)	5 (50)	2 (20)	7 (70)	21 (52)
Age — yr	65.8±4.5	63.8±4.3	72.8±1.2	72.6±1.1	68.7
Race or ethnic group — no. (%)†
Asian	0	0	1 (10)	0	1 (2)
White	10 (100)	10 (100)	9 (90)	10 (100)	39 (98)
Hispanic or Latino	0	0	1 (10)	0	1 (2)
Body-mass index‡	25.4±2.5	23.7±2.3	24.8±3.5	26.0±3.5	25.0±3.0

^*Plus–minus values are means ±SD.

^†Race or ethnic group was reported by the participants, who could select more than one category.

^‡The body-mass index is the weight in kilograms divided by the square of the height in meters.