Table 3 Estimated hazard ratios from a Cox proportional hazard regression with time to hospital readmission as the dependent variable. After propensity-score adjustment, and controlling for demographic and other patient characteristics, patients on a sulfonylurea were 29 % more likely to be readmitted to the hospital than patients on another oral antihyperglycemic agent. Unmarried patients and patients with eye disease were also more likely to be readmitted

Sulfonylurea

1.29

1.01–1.65

0.042

Age

1.01

0.98–1.03

0.749

Male

0.96

0.61–1.28

0.838

Race

 African American

0.89

0.66–1.28

0.512

 Other

0.96

0.61–1.52

0.867

 White

1.00

Region

 Northeast

1.00

0.65–1.44

0.864

 Midwest

0.86

0.62–1.18

0.349

 West

1.28

0.94–1.74

0.110

 South

1.00

Unmarried

1.44

1.04–1.99

0.030

Period of first hospital admission

 1999–2003

0.69

0.37–1.28

0.235

 2008–2010

0.49

0.31–0.78

0.003

 2004–2007

1.00

Cardiovascular disease

1.30

0.89–1.89

0.147

Renal disease

1.34

0.90–1.98

0.589

Eye disease

1.45

1.06–2.00

0.022

Perceived health status

 Good

0.76

0.49–1.18

0.221

 Fair or poor

1.09

0.70–1.67

0.709

 Excellent or very good

1.00

Physical limitations

1.09

0.79–1.51

0.589