Table 12.

Results for t Test for the Number of Higher Quality Obstetricians and Gynecologists.^a

		Large Metropolitan					Metropolitan					Micropolitan and Rural
Miles		15	30	60	120	240	15	30	60	120	240	15	30	60	120	240
HMO
50th percentile	MA	17.68	44.66	71.7	86.38	91.97	4.16	12.69	41.63	85.51	101.72	0.30	0.33	5.21	9.18	13.08
	TM	94.46	232.92	376.84	493.67	567.67	18.33	50.61	176.55	417.81	561.95	2.85	16.02	62.8	256.34	574.4
	%	18.72	19.17	19.03	17.50	16.20	22.70	25.07	23.58	20.47	18.10	10.53	2.06	8.30	3.58	2.28
4 stars	MA	10.15	25.65	42.74	53.14	56.86	2.98	8.86	26.8	52.72	62.48	0.00	0.01	3.20	5.16	7.82
	TM	53.78	133.97	224.33	300.63	344.47	12.63	34.61	112.62	257.47	340.19	1.39	8.84	36.08	152.46	336.11
	%	18.87	19.15	19.05	17.68	16.51	23.59	25.60	23.80	20.48	18.37	0.00	0.11	8.87	3.38	2.33
90th percentile	MA	6.14	15.42	25.44	30.06	31.83	1.23	4.42	14.94	29.2	34.35	0.00	0.01	1.90	3.28	4.77
	TM	26.58	66.97	110.66	142.44	162.6	5.08	16.48	55.95	124.4	160.54	0.52	3.97	16.66	70.18	152.41
	%	23.10	23.03	22.99	21.10	19.58	24.21	26.82	26.70	23.47	21.40	0.00	0.25	11.40	4.67	3.13
PPO
50th percentile	MA	8.11	23.79	52.81	65.95	74.46	1.36	6.70	28.78	60.38	70.8
	TM	99.11	246.72	395.29	509.9	581.75	21.18	55.19	178.29	445.58	550.37
	%	8.18	9.64	13.36	12.93	12.80	6.42	12.14	16.14	13.55	12.86
4 stars	MA	4.48	13.29	31.74	42.17	45.83	1.23	5.02	19.55	38.32	44.61
	TM	56.34	141.78	235.06	310.72	353.73	14.77	38.47	115.64	277.38	335.47
	%	7.95	9.37	13.50	13.57	12.96	8.33	13.05	16.91	13.81	13.30
90th percentile	MA	2.56	8.00	18.16	22.75	24.91	0.34	2.60	11.11	21.52	24.28
	TM	27.98	71.35	116.4	147.57	167.5	5.66	17.91	57.73	135.77	159.54
	%	9.15	11.21	15.60	15.42	14.87	6.01	14.52	19.24	15.85	15.22

Abbreviations: MA, Medicare Advantage; TM, traditional Medicare.

^aAll differences between TM and MA are significant at P < .001.