Table 1.

Relative ratios of gunshot events for each gunshot event type and city.

	Boston	Washington, DC	Baltimore	Boston	NYC	Philadelphia	Portland
	Gunshot	Gunshot	Shooting	Shooting	Shooting	Shooting	Shooting
Nighttime/ daytime Nighttime	45***	2.6***	2.1***	3.0***	2.8***	1.7***	2 7***
Weekday holiday/non-holiday	1.3*	1.7**	0.9	1.7	1.5	1.1	1.3
Monday holiday/non-holiday	1.2	1.1	1.0	1.3	1.6	0.9*	0.9
Weekend/weekday non-holiday Daytime	1.5**	1.3	1.2	1.7*	1.7**	1.2	1.3
Weekday holiday/non-holiday	1.2	2.4***	1.3	1.0	1.0	0.9	1.0
Monday holiday/non-holiday	1.4	1.5***	1.3	0.8	1.1	0.7*	0.9
Weekend/weekday non-holiday	1.3***	2.0***	1.0	1.2	1.1	1.1	1.0

Nighttime is defined as 1800–0559 h and daytime as 0600–1759 h. Weekends and holidays are defined as beginning at 1800 h the calendar day before and ending at 1759 h that calendar day.

We include p-value results for test of count data (not ratios) using a negative binomial distribution as a measure of the ratio:

^*p < 0.04.

^**p ≤ 0.01.

^***p ≤ 0.001.