Table 3.

Employment status and work productivity at year of diagnosis and current year, and estimated productivity costs among working-age individuals (n = 651)^*

	National average†	Lupus Outcomes Study participants		Change (current year to diagnosis year)
		Diagnosis year	Current year
Employed, %‡	75.3	76.8	48.7	−28.1
Labor force activity, mean ± SD
Hours per week	27.0	30.8 ± 20.6	19.1 ± 20.8	−11.7 ± 25.4
Weeks per year	33.8	33.7 ± 21.9	24.6 ± 24.6	−9.1 ± 28.8
Hours per year§	1,270.2	1,378.2 ± 1,045.4	899.5 ± 1,047.6	−478.6 ± 1,264.8
Estimated annual income, mean ± SD 2004 US dollars¶	22,978.68	24,931 ± 18,911	16,273 ± 18,951	−8,659 ± 22,880

^*Employment age is ≥18 and <65 years at current year.

^†Based on data derived from the Current Population Survey for women ages 25–54 years.

^‡Had a job or did any work for pay or profit.

^§Hours per year is a calculated variable; it represents the mean hours per year per subject (calculated for each subject by taking the product of hours per week and weeks per year).

^¶Estimates based on average national hourly earnings in 2004 US dollars ($18.09).