Marginal mean inflation-adjusted stick prices ($Aug2013) by PP/CPI phase, store type, city and SES category, estimated using linear mixed models, with post-estimation Wald tests for main effects and within-group comparisons
| Most-prominently advertised single pack by market segment | ||||
|---|---|---|---|---|
| Value brands (n=1135) | Mainstream brands (n=802) | Premium brands (n=3536) | All lowest-priced packs (n=5859) | |
| Stick price (95% CI) | Stick price (95% CI) | Stick price (95% CI) | Stick price (95% CI) | |
| Plain packaging/Consumer Price Index phase | (Wald χ2=61.36, p<0.001) | (Wald χ2=117.82, p<0.001) | (Wald χ2=822.63, p<0.001) | (Wald χ2=291.06, p<0.001) |
| May–July 2012 (Ref) | $0.576 ($0.567 to $0.584) | $0.694 ($0.683 to $0.704) | $0.742 ($0.738 to $0.747) | $0.573 ($0.568 to $0.579) |
| August–October 2012 | $0.577 ($0.569 to $0.585) | $0.704 ($0.694 to $0.713)** | $0.748 ($0.744 to $0.752)*** | $0.569 ($0.564 to $0.574)* |
| November 2012–January 2013 | $0.576 ($0.568 to $0.584) | $0.710 ($0.701 to $0.720)*** | $0.748 ($0.744 to $0.752)*** | $0.568 ($0.564 to $0.573)* |
| February–April 2013 | $0.595 ($0.587 to $0.604)*** | $0.736 ($0.726 to $0.746)*** | $0.777 ($0.773 to $0.782)*** | $0.597 ($0.592 to $0.602)*** |
| May–July 2013 | $0.588 ($0.578 to $0.597)* | $0.746 ($0.735 to $0.757)*** | $0.782 ($0.778 to $0.786)*** | $0.592 ($0.587 to $0.597)*** |
| August 2013 | $0.590 ($0.579 to $0.602)* | $0.757 ($0.744 to $0.771)*** | $0.793 ($0.787 to $0.798)*** | $0.591 ($0.585 to $0.598)*** |
| Store type | (Wald χ2=31.62, p<0.001) | (Wald χ2=55.58, p<0.001) | (Wald χ2=171.63, p<0.001) | (Wald χ2=58.52, p<0.001) |
| Supermarket (Ref) | $0.552 ($0.540 to $0.564) | $0.679 ($0.663 to $0.695) | $0.734 ($0.727 to $0.742) | $0.556 ($0.548 to $0.563) |
| Convenience store | $0.593 ($0.575 to $0.611)*** | $0.715 ($0.692 to $0.739)* | $0.749 ($0.739 to $0.759)* | $0.586 ($0.576 to $0.597)*** |
| Small mixed business† | $0.594 ($0.573 to $0.614)** | $0.714 ($0.676 to $0.751) | $0.767 ($0.754 to $0.779)*** | $0.598 ($0.585 to $0.611)*** |
| Petrol station | $0.605 ($0.586 to $0.624)*** | $0.753 ($0.739 to $0.766)*** | $0.794 ($0.787 to $0.800)*** | $0.590 ($0.583 to $0.598)*** |
| Newsagent/lottery | $0.589 ($0.573 to $0.605)*** | $0.680 ($0.656 to $0.704) | $0.739 ($0.729 to $0.748) | $0.591 ($0.581 to $0.601)*** |
| City | (Wald χ2=5.06, p=0.168) | (Wald χ2=7.00, p=0.072) | (Wald χ2=1.22, p=0.748) | (Wald χ2=12.48, p=0.006) |
| Sydney (Ref) | $0.576 ($0.563 to $0.589) | $0.722 ($0.707 to $0.738) | $0.762 ($0.756 to $0.769) | $0.591 ($0.584 to $0.598) |
| Melbourne | $0.587 ($0.575 to $0.600) | $0.718 ($0.704 to $0.732) | $0.762 ($0.755 to $0.768) | $0.575 ($0.568 to $0.582)** |
| Adelaide | $0.566 ($0.545 to $0.587) | $0.702 ($0.676 to $0.727) | $0.757 ($0.748 to $0.766) | $0.578 ($0.567 to $0.588)* |
| Perth | $0.592 ($0.577 to $0.608) | $0.745 ($0.723 to $0.768) | $0.763 ($0.753 to $0.773) | $0.573 ($0.563 to $0.584)** |
| Area socioeconomic status | (Wald χ2=2.71, p=0.438) | (Wald χ2=2.74, p=0.434) | (Wald χ2=1.07, p=0.784) | (Wald χ2=9.34, p=0.025) |
| Most disadvantage (Ref) | $0.583 ($0.568 to $0.598) | $0.714 ($0.697 to $0.731) | $0.760 ($0.752 to $0.768) | $0.571 ($0.563 to $0.580) |
| Moderate disadvantage | $0.584 ($0.565 to $0.602) | $0.711 ($0.688 to $0.735) | $0.762 ($0.753 to $0.771) | $0.581 ($0.571 to $0.590) |
| Low disadvantage | $0.590 ($0.577 to $0.602) | $0.729 ($0.714 to $0.744) | $0.759 ($0.752 to $0.766) | $0.578 ($0.571 to $0.586) |
| Least disadvantage | $0.574 ($0.560 to $0.588) | $0.724 ($0.707 to $0.740) | $0.764 ($0.757 to $0.771) | $0.589 ($0.582 to $0.597)** |
*p<0.05; **p<0.01; ***p<0.001.
†Includes corner stores, milk bars, delis, general stores, etc.