Hospital Stays per 10,000 Population by Most Frequent Major Reason, 1997-2009

**Hospital Stays per 10,000 Population by Most Frequent Major Reason, 1997-2009**
Major Diagnostic Category	Stays per 10,000 Population
Major Diagnostic Category	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009
Circulatory System	217	215	211	222	230	225	223	214	207	215	195	194	189
Pregnancy and Childbirth	160	155	156	163	157	161	158	162	159	161	168	154	150
Perinatal (Newborns)	144	141	143	150	145	149	146	151	150	149	156	144	140
Respiratory System	129	130	136	126	124	127	132	123	135	128	124	129	129
Digestive System	104	105	107	109	112	113	114	116	114	117	113	115	112
Musculoskeletal System	95	95	94	95	100	101	103	105	108	106	107	111	110
Note: Most frequent major reason is based on principal diagnosis defined by Major Diagnostic Category (MDC). Source: AHRQ, Center for Delivery, Organization, and Markets, Healthcare Cost and Utilization Project, Nationwide Inpatient Sample, 1997-2009.