Table 1

Differences in monthly per cent change in advertised pack price by tobacco type across 2017–2019, regression coefficients and adjusted marginal means

Factory-made cigarettes
(n=641)
Roll-your-own tobacco
(n=596)
Coefficient95% CIP valueCoefficient95% CIP value
Year0.26(−0.11 to 0.64)0.1640.29(−0.03 to 0.62)0.077
MonthF(11 625)=13.55, p<0.001F(11 580)=51.75, p<0.001
 January−0.55(−2.04 to 0.94)0.467−0.27(−1.54 to 1.00)0.672
 February0.53(−0.95 to 2.02)0.480−0.17(−1.45 to 1.10)0.788
 March*0.94(−0.54 to 2.42)0.2140.41(−0.86 to 1.68)0.530
 April0.98(−0.51 to 2.47)0.1960.73(−0.54 to 2.00)0.259
 May1.09(−0.40 to 2.58)0.152−0.58(−1.85 to 0.69)0.372
 June−0.70(−2.18 to 0.78)0.354−1.19(−2.47 to 0.10)0.070
 July0.21(−1.27 to 1.69)0.781−0.54(-1.81 to 0.73)0.400
 August (ref)1.001.00
 September*6.50(5.01 to 7.99)0.00011.10(9.83 to 12.36)0.000
 October2.99(1.50 to 4.48)0.0001.56(0.29 to 2.83)0.016
 November0.34(−1.15 to 1.83)0.6530.08(−1.20 to 1.35)0.907
 December−0.18(−1.67 to 1.31)0.811−0.58(−1.87 to 0.72)0.382
CompanyF(2625)=0.03, p=0.966F(2580)=0.37, p=0.690
 BATA (ref)1.001.00
 IT0.07(−0.67 to 0.82)0.8460.15(−0.49 to 0.79)0.655
 PM−0.02(−0.77 to 0.72)0.9540.29(−0.37 to 0.95)0.389
Supermarket0.13(−0.48 to 0.74)0.667−0.17(−0.07 to 0.35)0.519
Adjusted marginal means
Per cent95% CIP valuePer cent95% CIP value
January−0.54(−1.60 to 0.52)0.3150.08(−0.82 to 0.99)0.857
February0.54(−0.50 to 1.59)0.3080.18(−0.73 to 1.10)0.695
March0.95(−0.10 to 2.00)0.0750.76(−0.14 to 1.67)0.098
April0.99(−0.07 to 2.05)0.0661.09(0.18 to 1.99)0.019
May1.10(0.04 to 2.16)0.042−0.22(−1.13 to 0.69)0.634
June−0.69(−1.74 to 0.36)0.197−0.83(−1.75 to 0.10)0.079
July0.22(−0.83 to 1.27)0.679−0.19(−1.09 to 0.72)0.685
August0.01(−1.04 to 1.06)0.9830.36(−0.53 to 1.25)0.430
September6.51(5.45 to 7.57)0.00011.45(10.56 to 12.35)0.000
October3.01(1.95 to 4.06)0.0001.91(1.01 to 2.82)0.000
November0.35(−0.71 to 1.41)0.5130.43(−0.48 to 1.35)0.353
December−0.17(−1.23 to 0.89)0.752−0.22(−1.15 to 0.72)0.647
  • *Scheduled indexation increases occur on 1 March and 1 September of each year; additional 12.5% excise increases occurred on 1 September of each year.

  • BATA, British American Tobacco Australia; IT, Imperial Tobacco; PM, Philip Morris.