Table 3.
Overall incidence rate and clustering by SEP index quartiles
| High SEP | Medium-High SEP | Medium-Low SEP | Low SEP | |
|---|---|---|---|---|
| Number of block groups |
81 |
83 |
82 |
81 |
| Population, % |
26.3 |
24.8 |
24.2 |
24.7 |
| Total case count |
104 |
114 |
120 |
181 |
| Total populationa |
1 007 559 |
950 310 |
925 794 |
946 953 |
| 5-yr PY Incidence/100,000 |
10.32 |
12.00 |
12.96 |
19.11 |
| Clustered cases, %b |
27.9 |
38.6 |
44.2 |
47.5 |
| Non-clustered case 5-yr PY Incidence/100,000c |
7.44 |
7.37 |
7.24 |
10.03 |
| Cluster case 5-yr PY Incidence/100,000c | 2.88 | 4.63 | 5.72 | 9.08 |
SEP = Socioeconomic Position, PY = Person-Year.
aPopulation figure provides proportion of total population in block groups in a particular SEP quartile.
bChi squared test of proportions, top quartile vs. bottom quartile, P < .0001.
cChi squared test for trend across SEP quartiles, P = 0.001.