Table 1.

Means (SD)/median (Q1, Q3) and age-group differences in demographic, sleep, stress, health, cognitive and inflammation measures.

Construct	Young participants	Older participants
	(n = 47)	(n = 46)
Years of education	15.46 (2.16)	16.62 (3.06)
Typical sleep duration (in hours)	7.46 (1.45)	7.25 (1.09)
Current stress level	3.35 (1.35)	2.44 (1.85)
Health
Number of bodily symptoms	1 (0, 2)	4 (2, 7)
Physical health	8.50 (1.13)	8.49 (1.00)
Mental health	8.46 (1.20)	8.84 (1.21)
Cognitive measures
Processing speed	64.38 (10.15)	45.72 (7.71)
Short-term memory	9.23 (1.94)	7.63 (2.44)
Inflammation markers
IL-6	0.97 (0.71, 1.49)	2.07 (1.12, 2.62)
TNF-α	0.65 (0.45, 0.78)	0.91 (0.66, 1.25)
CRP	613.7 (316.56, 1812.73)	957.82 (438.13, 2276.4)

Note. Q1 = First Quartile; Q3 = Third Quartile. Typical Sleep Duration “How many hours do you normally sleep per night?” was measured by a single self-report item in hours. Current Stress Level “Please rate your current stress” was measured by a single self-report item on a scale from 1 = Not at all stressed to 10 = Extremely stressed. Number of Bodily Symptoms indicated the total number of symptoms that participants reported based on a brief review of all major bodily systems, in which participants indicated the presence (Yes or No) of each of 66 symptoms. Physical Health “Please rate your general physical health” and Mental Health “Please rate your general mental health/mood” were measured by single self-report items on a scale ranging from 1 = Poor to 10 = Excellent. We presented the median as well as the first and third quartiles for Number of Bodily Symptoms and for the inflammation biomarkers, given the positively skewed distribution of these variables. We applied bias-corrected bootstrapping with 10,000 resampling for the examination of age-group differences in the three inflammation biomarkers. Bold indicates significant age-group differences at p < 0.05.