. Author manuscript; available in PMC: 2008 Feb 22.

Published in final edited form as: Pharmacol Biochem Behav. 2006 May 2;83(3):441–447. doi: 10.1016/j.pbb.2006.03.005

Table 1.

Subject characteristics

	Total group (n=96)	Males (n=48)	Females (n=48)	p
Age (yr)	29 (0.6)	27 (0.8)	30 (0.9)	0.02
Body weight (kg)	72 (12.2)	80 (1.8)	65 (1.0)	0.0001
Body surface area (m²)	1.86 (.02)	2.00 (.02)	1.72 (.02)	0.0001
Body mass index (kg/m²)	23.8 (.3)	24.1 (.4)	22.5 (.5)	NS
Caffeine intake (mg/day)	458 (48)	451 (71)	464 (65)	NS
Screening blood pressure (mmHg)
Systolic	112 (1.1)	117 (1.6)	107 (1.1)	0.0001
Diastolic	66 (0.6)	66 (0.9)	66 (0.9)	NS
Heart rate	69 (1.1)	68 (1.4)	70 (1.6)	NS

Note: Entries show Mean (± SE). Caffeine intake reflects usual consumption from all sources based on structured interview. Screening blood pressure is the average of three readings taken over 5 min after 5 min of being seated.