Table 2.
Variable | No, % (95% CI)a | Yes, % (95% CI)a | P b | |
Survey year |
|
|
<.001 | |
|
1995 | 99.83 (98.84, 99.98) | 0.17 (0.02, 1.16) |
|
|
1998 | 99.43 (98.78, 99.73) | 0.57 (0.27, 1.22) |
|
|
2001 | 99.84 (98.89, 99.98) | 0.16 (0.02, 1.11) |
|
|
2004 | 90.86 (88.62, 92.70) | 9.14 (7.30, 11.38) |
|
|
2009 | 77.09 (73.95, 79.96) | 22.91 (20.04, 26.05) |
|
|
2012 | 66.27 (63.23, 69.18) | 33.73 (30.82, 36.77) |
|
Gender |
|
|
<.001 | |
|
Female | 80.36 (78.51, 82.09) | 19.64 (17.91, 21.49) |
|
|
Male | 85.80 (83.95, 87.47) | 14.20 (12.53, 16.05) |
|
Age group (years) |
|
|
.21 | |
|
18-24 | 79.92 (74.69, 84.30) | 20.08 (15.70, 25.31) |
|
|
25-34 | 83.93 (81.01, 86.47) | 16.07 (13.53, 18.99) |
|
|
35-44 | 83.22 (81.04, 85.19) | 16.78 (14.81, 18.96) |
|
|
45-54 | 82.89 (80.51, 85.04) | 17.11 (14.96, 19.49) |
|
|
55-64 | 85.14 (82.70, 87.29) | 14.86 (12.71, 17.30) |
|
Total | 83.13 (81.83, 84.35) | 16.87 (15.65, 18.17) |
|
a Percentages were weighted for probability of sample selection and adjusted by age, sex, and geographic area to the 2011 Estimated Resident Population of Western Australia.
b P values were derived from survey design–based Pearson chi-square test.