Table 1.

Number of Closures

Year	Number ANY Closures	Number ONLY Closures
1990	24	5
1991	31	8
1992	20	6
1993	16	7
1994	3	0
1995	10	4
1996	9	4
1997	8	3
1998	7	1
1999	12	4
1992–1998	73	25
1990–1999	140	42

N=134 counties.

Only years 1992–1998 (shaded) are included in the model; closures in the other years contribute due to lagged and leading terms. That is, a 1990 closure contributes to the model because in 1992 the twice-lagged term is nonzero.