Table 1. Characteristics of births (n = 1,475,457) and hospitals (n = 1,373) in the study population and among women with no prior cesareans, by hospital characteristics.

Characteristic	All Hospitals	Hospital Location/Teaching Status			Hospital Size
		Rural and Not Teaching	Urban and Not Teaching	Urban and Teaching	Small	Medium	Large
All births
Number of births	1,475,457	170,322	613,459	662,158	149,717	369,940	926,282
Number of hospitals	1,373	526	574	255	523	353	483
Number of states	46	44	41	39	46	45	44
Average cesarean rate for births	33.0%	31.7%	33.5%	32.9%	31.3%	32.7%	33.4%
Cesarean rate 95% confidence interval	32.9%, 33.1%	31.4%, 31.9%	33.4%, 33.6%	32.8%, 33.0%	31.1%, 31.5%	32.5%, 32.8%	33.3%, 33.5%
Births to women with no prior cesareans
Number of births	1,241,255	144,470	515,565	556,501	126,985	311,867	777,684
Number of hospitals	1,372	526	573	255	522	353	483
Number of states	46	44	41	39	46	45	44
Average cesarean rate for births	22.0%	20.3%	22.1%	22.5%	20.2%	21.8%	22.5%
Cesarean rate 95% confidence interval	22.0%, 22.1%	20.1%, 20.5%	22.0%, 22.2%	22.4%, 22.6%	19.9%, 20.4%	21.6%, 21.9%	22.4%, 22.6%

29,518 births (2%) are missing data on hospital characteristics.