Table 3.

Sensitivity Analyses

Sample Restriction	Timeframe (Year)			Maternal Age		Delivery Volume (Quarter)
	1998–2008	2002–2008	2000–2006	Age ≥40	30 > Age ≥20	>50	>100
Point value (reference: medical centers)	0.14	0.02	−0.09	−0.31	0.03	0.11	0.22
	(0.16)	(0.17)	(0.18)	(0.47)	(0.18)	(0.12)	(0.13)
Point value × regional hospitals	−0.54***	−0.62***	−0.49***	0.02	−0.80***	−0.59***	−0.38**
	(0.13)	(0.15)	(0.15)	(0.43)	(0.16)	(0.11)	(0.12)
Point value × local hospitals	−0.41**	−0.60***	−0.25	−0.02	−0.59***	−0.56***	−0.34**
	(0.14)	(0.16)	(0.16)	(0.45)	(0.17)	(0.11)	(0.12)
Point value × clinics	−0.62***	−0.50***	−0.34*	−0.38	−0.68***	−0.50***	−0.45***
	(0.12)	(0.14)	(0.13)	(0.40)	(0.15)	(0.11)	(0.11)
Point value × private	0.38*	0.40*	0.33	0.42	0.55**	0.29*	0.13
	(0.17)	(0.20)	(0.20)	(0.47)	(0.20)	(0.11)	(0.13)

Notes. All models are adjusted for hospital accreditation, ownership, total birth volume, birth volume time averages, region and year fixed effects.

Robust standard errors in parentheses ***p < .001, **p < .01, *p < .05.