Table 4.
Decades | Case | Control | Standardized differences | No. of areasa > 2SD | No. of areasa > critical valuesb | |
Premenopausal | 1940s | 36 | 86 | -2.35–2.12 | 2 | 0 |
1950s | 222 | 461 | -2.45–3.15 | 9 | 0 | |
1960s | 341 | 633 | -4.02–3.78 | 21 | 2 | |
1970s | 514 | 1025 | -3.89–3.96 | 35 | 2 | |
1980s | 552 | 1005 | -4.26–4.50 | 24 | 3 | |
1990s | 457 | 723 | -4.06–4.14 | 32 | 5 | |
Postmenopausal | 1930s | 389 | 676 | -2.51–2.62 | 24 | 0 |
1940s | 809 | 1253 | -3.01–3.04 | 23 | 0 | |
1950s | 1158 | 1968 | -3.66–2.91 | 22 | 0 | |
1960s | 1247 | 2072 | -4.18–2.99 | 18 | 0 | |
1970s | 1100 | 1839 | -4.98–3.13 | 21 | 0 | |
1980s | 960 | 1651 | -3.84–2.85 | 23 | 0 | |
1990s | 943 | 1542 | -4.40–3.57 | 22 | 0 |
a Areas refer to the rectangular grid overlaid on to the study area, b Critical values of 3.88 for premenopausal and 3.71 for postmenopausal residences.