Table 1.

Summary of subject demographics.

Age range	N	Sex	Mean PETCO2 mmHg
18–28 (CON)	14	10 F, 4 M	39.1 (3.4)
29–38 (CON)	11	9 F, 2 M	38.6 (3.1)
39–54 (CON)	11	3 F, 8 M	38.4 (3.7)
55–83 (CON)	11	2 F, 9 M	38.1 (3.8)
61–83 (MCI)	13	8 F, 5 M	36.2 (2.8)
Total	60	32 F, 28 M	38.1 (1.1)