Table 1.

Mean (standard deviation) and percent distribution of demographic, psychosocial, and socioeconomic characteristics for non-retirees in the Jackson Heart Study baseline sample (2000-2004) stratified by high and low John Henryism.

Characteristic		Non-retirees^a	Low John Henryism^b	High John Henryism^b
		N = 3978	N =1807	N = 1636
Age		50.8 (11.5)	49.6 (10.8)	51.7 (11.6)^***
Gender (%)	Male	38.1	36.7	37.8
	Female	61.9	63.3	62.2
John Henryism score		41.57 (4.5)	38.19 (3.4)	45.30 (1.6)^***
John Henryism (binary)	Low	52.5
	High	47.5
Stress score		5.7 (4.5)	6.1 (4.5)	5.3 (4.4)^***
Hypertension (%)	Yes	56.8	54.7	58.8^*
	No	43.2	45.3	41.2
Income (tertiles)	Low	27.1	23.7	27.3
	Middle	35.9	36.8	34.8
	High	37.0	39.5	37.9
Education	≤HS	13.0	8.9	15.2^***
	HS	20.0	17.8	21.0
	Some college	32.7	34.6	30.7
	≥College	34.3	38.7	33.1
Occupation	Manual	37.2	39.8	37.1^**
	Sales	23.5	20.6	24.7
	Service	18.9	21.4	17.2
	Management	20.4	18.2	21.0
Childhood SES	Low	23.7	21.5	25.6^**
	Middle	29.1	28.5	29.4
	High	47.2	50.0	45.0
Cumulative SES	Low	25.5	21.2	26.9^**
	Middle	36.1	36.0	34.8
	High	38.4	42.8	38.3

HS = High school; N = sample size; SES = Socioeconomic status. P values of tests of difference (low vs. high John Henryism groups):

=p<0.01,

^**

=p<0.05,

^***

=p<0.001.

N missing data in non-retirees: John Henryism score (535), stress score (483), hypertension (42), income (33), education (13), occupation (11, plus 46 excluded as “no occupation”), childhood SES (322), cumulative SES (11)

N missing data in low/high John Henryism categories= Stress score (213/195), hypertension (16/14), income (16/10), education (3/5), occupation (3+13 excluded as “no occupation”/5+18 excluded as “no occupation”), childhood SES (88/60), cumulative SES (6/2).