Table 1.

Summary statistics for tweet rates over counties by quarter

	Juul		Non-Juul ENDS
	Median (IQR)	Mean (SD)	Median (IQR)	Mean (SD)
Q1: Jan–Mar 2017	0.00 (0.00)	0.03 (0.13)	1.12 (2.87)	3.08 (21.47)
Q2: Apr–Jun 2017	0.00 (0.06)	0.09 (0.25)	1.15 (2.88)	2.68 (7.84)
Q3: Jul–Sep 2017	0.00 (0.10)	0.15 (0.44)	1.40 (3.32)	2.93 (6.10)
Q4: Oct–Dec 2017	0.21 (1.08)	0.96 (2.48)	1.54 (3.52)	3.11 (6.47)
Q5: Jan–Mar 2018	0.49 (1.75)	1.40 (3.30)	1.32 (3.18)	3.01 (10.38)
Q6: Apr–Jun 2018	1.95 (4.30)	3.31 (5.32)	1.17 (2.75)	2.58 (7.02)
Q7: Jul–Sep 2018	3.08 (5.12)	4.67 (6.54)	0.97 (2.21)	2.10 (5.68)
Q8: Oct–Dec 2018	3.91 (6.18)	6.03 (8.70)	1.38 (3.16)	2.81 (8.21)

IQR, Inter-quartile range = 75th percentile - 25th percentile; SD, Standard deviation.