Variable | SAH Incidence Model (χ2 = 3483, df = 20, P < .0001) | SAH Death Model (χ2 = 896, df = 20, P < .0001) | ||
---|---|---|---|---|
RRb | P value | RRb | P value | |
Temperature stratum (df = 6)c | see Figure 3A | .1453 | see Figure 3B | .3005 |
USDA zone (df = 8)c | see Figure 3ca | .0009a | see Figure 3D | .0863 |
Age (df = 1)d | 0.99 (0.98–1.01) | .5787 | 1.18 (1.16–1.19)a | <.0001a |
Female gender (df = 1)e | 1.03 (1.01–1.06)a | .0375a | 1.01 (0.98–1.03) | .5579 |
Teaching hospitals (df = 1)f | 1.25 (1.20–1.32)a | <.0001a | 0.90 (0.85–0.97)a | <.0001a |
Large hospital bed size (df = 1)g | 1.07 (1.02–1.11)a | .0017a | 0.99 (0.94–1.01) | .1124 |
Urban location (df = 1)h | 1.09 (1.04–1.15)a | .0003a | 0.97 (0.92–1.02) | .1358 |
↵a Indicates significant effects.
↵b RR with 95% confidence interval as defined in Materials and Methods.
↵c See Materials and Methods for a description of stratifications and groupings.
↵d Change in RR for every 10-year increase in age.
↵e Compared to males.
↵f Compared with nonteaching hospitals.
↵g Compared with small and medium-sized hospitals.
↵h Compared with rural hospital locations.