Table 1

Summary statistics

Price discounts observed (cents off/mL of e-liquid)	Observed	Frequency (%)	Mean	SD	Min	Max
Yes	13 324	92.5	16.84	8.96	0.07	120.00
No	1083	7.5	N/A	N/A	N/A	N/A
Total	14 407

Products with price discounts observed
Independent variables: attributes	Observed	Frequency (%)	Price discounts (cents off/mL of e-liquid)
Independent variables: attributes	Observed	Frequency (%)	Mean	SD	Min	Max
Nicotine concentration
No nicotine	3112	23	13.61	5.32	0.07	45.00
1–5 mg	3308	25	13.56	5.38	0.07	45.00
6–11 mg	3306	25	13.58	5.39	0.07	45.00
12–35 mg	1902	14	25.11	10.77	1.67	120.00
35–60 mg	1696	13	26.26	10.45	3.33	67.76
Total	13 324	100	16.84	8.96
Nicotine form
None	3112	23	13.61	5.32	0.07	45.00
Freebase	6942	52	13.64	5.42	0.07	45.00
Salt	3270	25	26.71	10.43	2.67	120.00
Total	13 324	100	16.84	8.96
VGPG ratio
70/30	6664	50	13.76	6.05	0.07	63.33
50/50	1656	12	22.23	8.62	3.33	56.67
75/25	558	4	14.62	5.65	1.00	60.00
80/20	647	5	12.77	4.65	3.00	45.00
Other	1098	8	17.88	8.28	2.50	56.67
Missing	2701	20	22.15	12.07	2.50	120.00
Total	13 324	100	16.84	8.96
Flavour
Tobacco/unflavoured	483	4	18.68	9.53	1.67	63.33
Fruit, no other flavours	4615	35	16.51	8.80	1.00	93.33
Sweets, not menthol or fruit	1083	8	14.42	6.62	2.50	46.67
Any menthol	3642	27	17.15	8.64	1.00	60.00
Nut/spice/alcohol/beverage, not menthol	3501	26	17.45	9.83	0.07	120.00
Total	13 324	100	16.84	8.96
Bottle volume size (mL)
1–30	3043	23	26.83	10.11	0.07	45.00
31–60	4401	33	15.61	5.85	0.07	45.00
61–90	206	2	17.22	12.27	0.07	45.00
91–120	4891	37	11.73	4.40	1.67	120.00
≥121	783	6	16.78	7.48	3.33	67.76
Total	13 324	100	16.84	8.96

The price discount (cents off/mL) is calculated by using the following equation: Price_discount_per_mL_ij=[(regular_retail_price_per_mL_ij−discounted_price_per_mL_ij)/regular_retail_price_per_mL_ij]×100 (i denotes product and j denotes store).
VGPG, vegetable glycerine/propylene glycol.