Table 2.
Back beliefs questionnaire. Mean scores* and changes in score from first survey by state (Victoria, New South Wales) and survey (1–August 1997, 2–August 1999, 3–February 2000)
| Survey | No | Mean score (95% CI) | Difference in mean score from survey 1 (95% CI) | P value |
|---|---|---|---|---|
| Victoria | ||||
| 1 | 1185 | 26.5 (26.1 to 26.8) | ||
| 2 | 590 | 28.4 (27.9 to 28.8) | 1.9 (1.3 to 2.5) | <0.001 |
| 3 | 592 | 29.7 (29.2 to 30.3) | 3.2 (2.6 to 3.9) | <0.001 |
| New South Wales | ||||
| 1 | 1185 | 26.3 (25.9 to 26.6) | ||
| 2 | 590 | 26.2 (25.7 to 26.7) | −0.04 (−0.7 to 0.6) | 0.9 |
| 3 | 588 | 26.3 (25.7 to 26.8) | 0.02 (−0.6 to 0.7) | 1.0 |
| Difference between states | ||||
| 1 | 2370 | 0.24 (−0.27 to 0.76) | ||
| 2 | 1180 | 2.14 (1.44 to 2.83) | 1.9 (1.0 to 2.8) | <0.001 |
| 3 | 1180 | 3.46 (2.70 to 4.22) | 3.2 (2.3 to 4.1) | <0.001 |
*
Possible range of scores 9-45.