Pre-2010 | Post-2010 | |||||||
Data from month | β (Feb-Apr) or δ | 95% CI | N | R2 | β | 95% CI | N | R2 |
Feb | 0.04*** | 0.03 to 0.06 | 1676 | 0.02 | 0.02 | −0.01 to 0.05 | 1213 | 0.00 |
Mar | 1.21*** | 1.18 to 1.25 | 1700 | 0.84 | 1.11*** | 1.06 to 1.15 | 1187 | 0.69 |
Apr | 0.13*** | 0.10 to 0.15 | 1176 | 0.09 | 0.12*** | 0.09 to 0.14 | 1678 | 0.06 |
May | 0.04*** | 0.02 to 0.06 | 1199 | 0.03 | 0.01*** | −0.00 to 0.03 | 1606 | 0.00 |
Jun | 0.05*** | 0.03 to 0.06 | 1211 | 0.04 | 0.00 | −0.02 to 0.02 | 1602 | 0.00 |
Jul | 0.33*** | 0.28 to 0.37 | 1216 | 0.29 | 0.11*** | 0.09 to 0.14 | 1667 | 0.05 |
Aug | 0.94*** | 0.88 to 1.00 | 1210 | 0.54 | 0.15*** | 0.13 to 0.18 | 1493 | 0.14 |
Sep | 0.11*** | 0.09 to 0.14 | 1202 | 0.09 | 0.17*** | 0.14 to 0.20 | 1436 | 0.11 |
Oct | 0.05*** | 0.03 to 0.06 | 1205 | 0.03 | 0.01 | −0.01 to 0.02 | 1447 | 0.00 |
Nov | 0.04*** | 0.02 to 0.05 | 1190 | 0.02 | 0.02* | −0.00 to 0.04 | 1447 | 0.00 |
Dec | 0.02 | −0.01 to 0.05 | 1189 | 0.00 | 0.02** | 0.00 to 0.03 | 1455 | 0.00 |
Jan | 0.03*** | 0.01 to 0.05 | 1151 | 0.01 | −0.00 | −0.02 to 0.01 | 1280 | 0.00 |
The β coefficients for February to April are derived from equation 1 (in text), and are pass-through coefficients. The δ coefficients for May to January are derived from equation 2 and indicate the month-on-month average increase in cigarette prices, expressed in rand per pack. N = the number of brand-region combinations.
Significance: ***=1%; **=5%; *=10%