Table 1.

Descriptive statistics for overall sample and by race.

	All		Whites		Blacks
	n	%	n	%	n	%
Race
White	3,790	81.26	3,790			81.26
Black	874			18.74	874	18.74
Gender*
Male	1,942	41.64	276	31.58	1,666	43.96
Female	2,722	58.36	598	68.42	2,124	56.04
Hispanics
No	4,634	99.40	866	99.08	3,768	99.47
Yes	28	0.60	8	0.92	20	0.53
Cohort*
Progression Cohort	1,346	28.86	372	42.56	974	25.70
Incidence Cohort	3,198	68.57	495	56.64	2,703	71.32
Control Cohort	120	2.57	7	0.80	113	2.98
High Income*
No	1,690	39.17	490	63.80	1,200	33.84
Yes	2,624	60.83	278	36.20	2,346	66.16
Overweight/obesity	*
No	1,033	22.15	75	8.58	958	25.28
Yes	3,631	77.85	799	91.42	2,832	74.72
	Mean	SD	Mean	SD	Mean	SD
Age (Years) *	62.30	0.14	62.76	0.15	60.15	0.30

Source: Osteoarthritis Initiative (OAI), 2004–2006

^*p < 0.05.