Table 1.

Median policy duration by US census region.

Census region	Level 1	Level 2	Level 3	Level 4
	Median (IQR)	Median (IQR)	Median (IQR)	Median (IQR)
Pacific	11 (8–13)	2 (1–3)	3 (0–6)	33 (14–52)
Mountain	4 (4–5)	4 (1–4)	6 (0–8)	30 (11–48)
North Central	6 (5–7)	4 (2–4)	8 (4–14)	23 (0–45)
South Central	6 (4–6)	2 (1–5)	9 (5–13)	31 (14–47)
South Atlantic	5 (4–6)	4 (1–8)	10 (6–15)	27 (10–44)
Middle Atlantic & New England	9 (5–10)	3 (1–4)	2 (0–5)	34 (15–52)