Table 6.

Patient work status by interval compared with baseline

	6 mo	12 mo	24 mo
Worse from baseline (95% confidence interval)	2.1% (0.1%–11.3%)	4.4% (0.5%–15.2%)	7.1% (1.5%–19.5%)
No change or improved from baseline (95% confidence interval)	97.9% (88.7%–100.0%)	95.6% (84.9%–99.5%)	92.9% (80.5%–98.5%)