Calendar year: 1988
Data sources: CA, CO, FL, IL, IA, MA, NJ, WA
No. of hospitals: 759
No. of inpatient stays: 5,265,756
Calendar year: 1989
Data sources: AZ, CA, CO, FL, IL, IA, MA, NJ, PA, WA, WI
(Added AZ, PA, WI)
No. of hospitals: 882
No. of inpatient stays: 6,110,064
Calendar year: 1990
Data sources: AZ, CA, CO, FL, IL, IA, MA, NJ, PA, WA, WI
(No change)
No. of hospitals: 871
No. of inpatient stays: 6,268,515
Calendar year: 1991
Data sources: AZ, CA, CO, FL, IL, IA, MA, NJ, PA, WA, WI
(No change)
No. of hospitals: 859
No. of inpatient stays: 6,156,188
Calendar year: 1992
Data sources: AZ, CA, CO, FL, IL, IA, MA, NJ, PA, WA, WI
(No change)
No. of hospitals: 856
No. of inpatient stays: 6,195,744
Calendar year: 1993
Data sources: AZ, CA, CO, CT, FL, IL, IA, KS, MD, MA, NJ, NY, OR, PA, SC, WA, WI (Added CT, KS, MD, NY, OR, SC)
No. of hospitals: 913
No. of inpatient stays: 6,538,976
Calendar year: 1994
Data sources: AZ, CA, CO, CT, FL, IL, IA, KS, MD, MA, NJ, NY, OR, PA, SC, WA, WI (No change)
No. of hospitals: 904
No. of inpatient stays: 6,385,011
Calendar year: 1995
Data sources: AZ, CA, CO, CT, FL, IL, IA, KS, MD, MA, MO, NJ, NY, OR, PA, SC, TN, WA, WI (Added MO, TN)
No. of hospitals: 938
No. of inpatient stays: 6,714,935
Calendar year: 1996
Data sources: AZ, CA, CO, CT, FL, IL, IA, KS, MD, MA, MO, NJ, NY, OR, PA, SC, TN, WA, WI (No change)
No. of hospitals: 906
No. of inpatient stays: 6,542,069
Calendar year: 1997
Data sources: AZ, CA, CO, CT, FL, GA, HI, IL, IA, KS, MD, MA, MO, NJ, NY, OR, PA, SC, TN, UT, WA, WI (Added GA, HI, UT)
No. of hospitals: 1,012
No. of inpatient stays: 7,148,420
Calendar year: 1998
Data sources: AZ, CA, CO, CT, FL, GA, HI, IL, IA, KS, MD, MA, MO, NJ, NY, OR, PA, SC, TN, UT, WA, WI (No change)
No. of hospitals: 984
No. of inpatient stays: 6,827,350
Calendar year: 1999
Data sources: AZ, CA, CO, CT, FL, GA, HI, IL, IA, KS, MD, MA, ME, MO, NJ, NY, OR, PA, SC, TN, UT, VA, WA, WI (Added ME, VA)
No. of hospitals: 984
No. of inpatient stays: 7,198,929