Table 1.

Characteristics of sample population from NSHAP wave I (n = 1684)

Construct	Variable	Units	Mean	SD	Range
Quality of life	Generally feeling happy	Points	3.61	0.86	1–5
	Happiness with relationships	Points	5.91	1.61	1–7
Chronic inflammation	C-reactive protein serolevel	mg/L	1.72	1.46	0–5.98
Medical sequelae	Functional disability	Points	1.10	1.75	0–9
	Pain while walking	Yes/No	0.38	0.49	0–1
	Diagnosed chronic condition	Yes/No	0.88	0.32	0–1
Chronological age	Years of age	Years	69.6	7.90	57–85
Sex identity	Male	Yes/No	0.50	0.50	0–1
	Female		0.50	0.50
Racial background	White	Yes/No	0.75	0.43	0–1
	Minority		0.25	0.43
Educational attainment	Years of education	Years	12.6	4.08	0–32