Table 3.
Geographic variation in pathology-based PBC prevalence, by age group
| 40–49 yo | 50–59 yo | 60–69 yo | 70–79 yo | 80–109 yo | Test for difference | |
| State | ||||||
| QLD | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | |
| NSW/ACT | 1.18 (0.75, 1.86) | 1.25 (0.91, 1.72) | 0.84 (0.63, 1.11) | 1.43 (1.00, 2.04) | 0.49 (0.32, 0.76) | P = 0.046 |
| VIC | 1.77 (1.13, 2.78) | 2.12 (1.55, 2.90) | 1.47 (1.12, 1.92) | 2.04 (1.42, 2.92) | 1.18 (0.80, 1.75) | P = 0.19 |
| SA | 2.92 (1.72, 4.95) | 1.97 (1.31, 2.96) | 1.60 (1.14, 2.26) | 2.28 (1.48, 3.53) | 1.91 (1.22, 2.99) | P = 0.60 |
| TAS | 3.16 (1.48, 6.72) | 2.20 (1.26, 3.85) | 1.51 (0.89, 2.55) | 3.29 (1.90, 5.70) | 2.03 (1.06, 3.90) | P = 0.89 |
| Trend: | P < 0.001 | P < 0.001 | P < 0.001 | P < 0.001 | P < 0.001 | P = 0.84 |
| Region type | ||||||
| Regional | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | |
| Metro | 1.54 (1.11, 2.15) | 1.15 (0.90, 1.48) | 1.54 (1.23, 1.93) | 1.55 (1.20, 1.99) | 1.41 (1.01, 1.97) | P = 0.55 |
| Capital | 1.08 (0.74, 1.57) | 1.29 (1.01, 1.64) | 1.58 (1.26, 1.99) | 1.39 (1.06, 1.81) | 1.71 (1.25, 2.35) | P = 0.090 |
| Trend: | P = 0.37 | P = 0.040 | P < 0.001 | P = 0.004 | P = 0.001 | P = 0.10 |
| Latitude (continuous) | 1.06 (1.02, 1.09) P = 0.002 | 1.06 (1.03, 1.08) P < 0.001 | 1.04 (1.02, 1.07) P < 0.001 | 1.06 (1.04, 1.09) P < 0.001 | 1.04 (1.01, 1.08) P = 0.019 | P = 0.83 |
| Latitude (quintiles) | ||||||
| −18.02, −27.59 | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | |
| <-27.59, −33.85 | 1.11 (0.65, 1.90) | 1.21 (0.84, 1.75) | 1.25 (0.89,1.75) | 1.28 (0.85, 1.94) | 0.62 (0.36, 1.07) | P = 0.29 |
| <-33.85, −35.33 | 1.61 (0.98, 2.64) | 1.28 (0.88, 1.85) | 1.00 (0.70, 1.42) | 1.58 (1.05, 2.37) | 1.09 (0.67, 1.79) | P = 0.65 |
| <-35.33, −37.75 | 1.11 (0.60, 2.07) | 1.54 (1.03, 2.28) | 1.36 (0.93, 2.00) | 1.37 (0.86, 2.19) | 0.83 (0.45, 1.54) | P = 0.31 |
| <-37.75, −42.72 | 1.85 (1.15, 2.99) | 2.08 (1.48, 2.92) | 1.72 (1.26, 2.35) | 1.95 (1.33, 2.86) | 1.55 (0.98, 2.43) | P = 0.64 |
| Trend: | P = 0.019 | P < 0.001 | P < 0.001 | P = 0.001 | P = 0.015 | P = 0.90 |
Analyses by Poisson regression, estimating an IRR (95% CI). All models except region type adjusted for region type.
Bold indicates statistical significance.