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Table 1 Social and demographic characteristics of the 45 and Up Study and the NSW PHS populations

From: Investigation of relative risk estimates from studies of the same population with contrasting response rates and designs

  45 and Up Study PHS
Social and Demographics       
Characteristics a N Crude % (95% CI) Weighted b % (95% CI) N Crude % (95% CI) Weighted c % (95% CI)
Sex       
Male 48851 48.0 (47.7, 48.3) 48.0 (47.6, 48.4) 5766 39.0 (38.2, 39.8) 48.4 (47.4, 49.5)
Female 52961 52.0 (51.7, 52.3) 52.0 (51.6, 52.4) 9030 61.0 (60.2, 61.8) 51.6 (50.5, 52.6)
Age       
45-49 years 12399 12.2 (12.0, 12.4) 18.9 (18.6, 19.2) 1803 12.2 (11.7, 12.7) 19.3 (18.3, 20.3)
50-54 years 16120 15.8 (15.6, 16.1) 17.1 (16.8, 17.4) 2043 13.8 (13.3, 14.4) 17.5 (16.6, 18.4)
55-59 years 17350 17.0 (16.8, 17.3) 15.9 (15.7, 16.2) 2188 14.8 (14.2, 15.4) 16.2 (15.4, 17.0)
60-64 years 15342 15.1 (14.8, 15.3) 12.6 (12.4, 12.8) 2252 15.2 (14.6, 15.8) 12.5 (11.9, 13.1)
65-69 years 12800 12.6 (12.4, 12.8) 10.1 (9.9, 10.3) 1939 13.1 (12.6, 13.6) 10.2 (9.6, 10.8)
70-74 years 9564 9.4 (9.2, 9.6) 8.3 (8.1, 8.5) 1710 11.6 (11.0, 12.1) 8.5 (8.0, 8.9)
75-79 years 7235 7.1 (6.9, 7.3) 7.3 (7.2, 7.5) 1490 10.1 (9.6, 10.6) 7.3 (6.9, 7.8)
80-84 years 7545 7.4 (7.2, 7.6) 5.4 (5.3, 5.6) 922 6.2 (5.8, 6.6) 5.9 (5.4, 6.3)
≥ 85 years 3457 3.4 (3.3, 3.5) 4.3 (4.1, 4.4) 449 3.0 (2.8, 3.3) 2.6 (2.3, 2.9)
Remoteness (ARIA+)       
Major City 44146 43.4 (43.1, 43.7) 69.1 (68.8, 69.4) 6718 45.4 (44.6, 46.2) 60.6 (59.6, 61.6)
Inner Regional 36640 36.0 (35.7, 36.3) 22.7 (22.5, 23.0) 4351 29.4 (28.7, 30.1) 24.4 (23.5, 25.2)
Outer Regional 18926 18.6 (18.4, 18.8) 7.6 (7.5, 7.7) 3086 20.9 (20.2, 21.5) 12.2 (11.6, 12.7)
Remote 2100 2.1 (2.0, 2.1) 0.6 (0.5, 0.6) 456 3.1 (2.8, 3.4) 1.3 (1.2, 1.5)
Missing 0 - - 185 1.3 (1.1, 1.4) 1.5 (1.2, 1.8)
Language other than English spoken at home       
No 92230 90.6 (90.4, 90.8) 87.4 (87.1, 87.7) 13379 93.0 (92.6, 93.4) 89.5 (88.7, 90.3)
Yes 9580 9.4 (9.2, 9.6) 12.6 (12.3, 12.9) 986 6.9 (6.4, 7.3) 10.4 (9.6, 11.2)
Missing 2 0.0 (0.0, 0.0) 0.0 (0.0, 0.0) 17 0.1 (0.0, 0.2) 0.1 (0.0, 0.2)
Country of Birth       
Australia 75821 74.5 (74.2, 74.7) 70.8 (70.5, 71.1) 11332 76.6 (75.9, 77.3) 71.1 (70.1, 72.2)
Not Australia 24964 24.5 (24.3, 24.8) 28.2 (27.9, 28.6) 3433 23.2 (22.5, 23.9) 28.7 (27.7, 29.7)
Missing 1027 1.0 (0.9, 1.1) 1.0 (0.9, 1.0) 24 0.2 (0.1, 0.2) 0.2 (0.1, 0.2)
Private Health Insurance       
No 38300 37.6 (37.3, 37.9) 33.9 (33.6, 34.3) 6766 45.7 (44.9, 46.5) 41.5 (40.4, 42.5)
Yes 63508 62.4 (62.1, 62.7) 66.1 (65.7, 66.4) 7973 53.9 (53.1, 54.7) 58.2 (57.1, 59.3)
Missing 4 0.0 (0.0, 0.0) 0.0 (0.0, 0.0) 57 0.4 (0.3, 0.5) 0.3 (0.2, 0.4)
Educational Attainment       
No School Certificate 12385 12.2 (12.0, 12.4) 10.9 (10.7, 11.1) 2017 13.7 (13.1, 14.2) 11.7 (11.1, 12.3)
School Certificate 22608 22.2 (22.0, 22.5) 20.3 (20.0, 20.6) 3732 25.3 (24.6, 26.0) 20.6 (19.8, 21.4)
Trade/Certificate/Diploma 32289 31.7 (31.4, 32.0) 31.0 (30.6, 31.3) 1631 26.5 (25.8, 27.2) 29.5 (28.5, 30.5)
Higher School Certificate 9787 9.6 (9.4, 9.8) 10.1 (9.9, 10.3) 3902 11.1 (10.6, 11.6) 10.9 (10.2, 11.6)
Tertiary Qualification 22802 22.4 (22.1, 22.7) 25.9 (25.6, 26.3) 3096 21.0 (20.3, 21.7) 25.0 (24.0, 26.0)
Missing 1941 1.9 (1.8, 2.0) 1.8 (1.8, 1.9) 360 2.4 (2.2, 2.7) 2.3 (2.0, 2.6)
Household Income       
<$20,000 p.a 20633 20.3 (20.0, 20.5) 17.9 (17.6, 18.1) 4505 30.4 (29.7, 31.2) 22.2 (21.4, 22.9)
$20,000-$39,999 p.a 18386 18.1 (17.8, 18.3) 15.3 (15.1, 15.6) 3145 21.3 (20.6, 21.9) 20.3 (19.5, 21.1)
≥$40,000 p.a 39792 39.1 (38.8, 39.4) 44.6 (44.2, 44.9) 4768 32.2 (31.5, 33.0) 41.4 (40.3, 42.5)
Missing 23001 22.6 (22.3, 22.8) 22.2 (21.9, 22.5) 2378 16.1 (15.5, 16.7) 16.2 (15.4, 17.0)
  1. ARIA+, Accessibility Remoteness Index of Australia; CI, Confidence Interval; p.a, per annum
  2. a Characteristics above the line-break are highly comparable across the two surveys. Characteristics below the line-break are moderately comparable across the two surveys. Weighted prevalence estimates for age, sex and remoteness differ across the two studies since the weighting schemes vary.
  3. b Weighted by age, sex and remoteness
  4. c Weighted by area health service, probability of selection in the household and the number of residential connections to the house