Table 2.

Summary of articles addressing the effects of uninsurance on access to specialty care.

Author	Year	Sample Size	Data Source	Study Design	Access Measure	Statistic	Comparison	Findings	Endogeneity/Selection
Kane et al. [12]	2005	700	National Survey of CSHCN, single state	Cross-sectional	Unmet needs	Logistic regression; likelihood of unmet need	Ever uninsured vs. insured all year	OR = 8.6, p < 0.001	No consideration of selection into insurance
Mayer et al. [13]	2003	38,866	National Survey of CSHCN	Cross-sectional	Unmet need	Logistic regression; likelihood of unmet need for specialty care	Private insurance vs. uninsured	OR = 4.29, p < 0.01	No consideration of selection into coverage type
Park et al. [14]	2002	1,985	National Health Interview Survey	Cross-sectional	Utilization	Proportion having seen a specialist (exact values not reported)	Uninsured vs. any insurance type	Less likely vs. any insurance	No consideration of selection into coverage type
Perlstein et al. [15]	1997	544	Regional cardiac registry	Retrospective cohort	Time to referral	t-test; mean age at referral	Uninsured vs. "commercial"	251 days vs. 80 days, p < 0.05	No consideration of selection into coverage type
Szilagyi, et al. [16]	2000	2,126	Single SCHIP	Quasi-experimental	Utilization	t-test, difference in number of specialist visits (pre- and post-enrollment)	Uninsured vs. following SCHIP enrollment	Fivefold increase in utilization after SCHIP enrollment	No consideration of selection in program