Table 1.

Median price change for tobacco products in San Francisco and Alameda County: 2014–2020 San Francisco Bay Area young adult health study retail data.

	San Francisco				Difference in medians	Alameda County				Difference in medians
Tobacco Product	2015		2019/20		2019/20 vs 2015	2015		2019/20		2019/20 vs 2015
	N	Median IQR	N	Median IQR	Estimate (SE) (95% CI) a	N	Median IQR	N	Median IQR	Estimate (SE) 95% CIa
Cheapest cigs	97	5.75 5.13, 7.02	105	10.36 8.50, 12.52	4.61 (0.43)*** 3.78–5.45	119	5.48 5.10, 6.07	142	7.58 6.98, 9.00	2.10 (0.14)*** 1.82–2.39
Newport menthol cigs	92	8.12 7.55, 8.80	0	–	–	113	7.12 6.87, 7.61	82	9.28 8.78, 10.30	2.16 (0.19)*** 1.79–2.53
Blu menthol e-cigs	26	11.33 10.79, 11.88	0	–	–	53	10.79 10.79, 11.87	17	12.48 11.98, 13.98	1.69 (0.53)** 0.63–2.75
Cheapest vape pen	18	17.27 10.79, 21.60	9	31.38 19.98, 40.00	13.03 (7.90) −3.24–29.30	25	19.44 10.79, 21.60	6	15.70b 15.00, 31.38–16.57–9.09	−3.74 (6.27)b

Notes: Data shown are summary statistics (mean, std, min, max, median, IQR: 25^th and 75^th percentiles) for tobacco products in U.S. dollars. Prices for 2015 were adjusted for inflation.

^***p < 0.001

^**p < 0.01

^*p < 0.05.

^aEstimates obtained from unadjusted quantile regression models using PROC QUANREG in SAS 9.4.

^bBecause of even number of observations (n = 6), the regression model used the 3rd rank value of 2019 prices as the reference value and the difference in medians over time shown is between $19.44 and $15.70. If defining median as the value that is between the 3rd and 4th rank price values, then 2019 median price = $17.84.