The Impact of Access Regulation on Health Insurance Market Structure. Table 11: Estimated Coefficients and Standard Errors: Group Market

10/20/2000

  NUMINS (1) NUMINS (2) NUMINSa (3) BCBS (4) HMO (5) HMO (6) COMM (7) COMM (8) HERF (9) TOP5 (10) LOSSRb (11) LOSSRb (12)
Constant 26.677*
(6.854)
27.276*
(6.936)
30.167
(5.023)
0.244
(0.192)
0.341**
(0.172)
0.515*
(0.106)
0.414*
(0.119)
0.485*
(0.106)
0.026
(.093)
0.572*
(0.077)
0.550**
(0.258)
0.586***
(0.338)
POP 4.179*
(1.569)
4.242*
(1.577)
2.973**
(1.291)
0.026
(0.044)
0.074***
(0.039)
0.093*
(0.024)
-0.100*
(0.027)
-0.093*
(0.024)
-0.0091
(0.021)
0.018
(0.018)
-0.034
(0.068)
-0.034
(0.069)
PREEX -0.078**
(0.032)
-0.076**
(0.033)
3.137
(2.033)
0.00077
(0.001)
-0.00041
(0.001)
0.00014
(0.000)
-0.00036
(0.001)
-0.00014
(0.000)
0.0012*
(0.000)
0.00075**
(0.000)
0.000
(0.001)
0.000
(0.001)
SOMALL -0.736
(1.346)
-0.655
(1.356)
-0.213
(1.305)
0.033
(0.038)
-0.039
(0.034)
-0.015
(0.021)
0.0056
(0.023)
0.015
(0.021)
0.031***
(0.018)
0.019
(0.015)
0.015
(0.046)
0.010
(1.046)
ALL 5.504***
(2.981)
5.392***
(2.995)
2.514***
(2.446)
-0.046
(0.083)
0.011
(0.075)
-0.022
(0.046)
0.035
(0.052)
0.022
(0.046)
-0.018
(0.041)
-0.062**
(0.034)
-0.048
(0.101)
-0.048
(0.103)
GRENEW 1.450
(7.542)
2.013
(7.615)
  0.230
(0.211)
-0.256
(0.189)
-0.093
(0.117)
0.026
(0.131)
0.093
(0.117)
0.239**
(0.103)
0.145***
(0.085)
0.353
(0.291)
0.315
(0.293)
AGE -12.455
(8.886)
-12.749
(8.926)
-9.445**
(4.129)
-0.120
(0.249)
0.074
(0.223)
-0.011
(0.137)
0.046
(0.154)
0.011
(0.137)
-0.171
(0.121)
-0.059
(0.100)
-0.154
(0.353)
-0.129
(0.355)
HEALTH -15.381**
(6.214)
-15.607**
(6.243)
-12.685*
(4.8)
-0.092
(0.174)
0.089
(0.156)
0.023
(0.096)
0.0032
(0.108)
-0.023
(0.096)
-0.117
(0.084)
-0.0036
(0.070)
-0.269
(0.240)
-0.247
(0.241)
COMPOSIT 15.506**
(6.668)
15.431**
(6.691)
12.566*
(3.379)
-0.03
(0.187)
0.095
(0.167)
0.073
(0.103)
-0.064
(0.115)
-0.073
(0.103)
0.056
(0.091)
-0.027
(0.075)
0.092
(0.233)
0.078
(0.234)
BCBS   -2.452
(3.756)
      -0.710*
(0.058)
  -0.290*
(0.058)
       
NUMINS                     0.000
(0.004)
0.000
(0.004)
HERF                     -0.260
(0.257)
 
TOP5                       -0.089
(0.328)
1995DUM -1.128**
(0.507)
-1.098**
(0.511)
-1.045***
(0.489)
0.012
(0.014)
-0.033*
(0.013)
-0.024*
(0.008)
0.021**
(0.009)
0.024**
(0.008)
0.014**
(0.007)
0.001
(0.006)
-0.002
(0.019)
-0.006
(0.019)
1996DUM 0.469
(0.464)
0.465
(0.466)
0.554
(0.448)
-001.9
(0.013)
-0.0059
(0.012)
-0.0073
(0.007)
0.0078
(0.008)
0.0073
(0.007)
0.0076
(0.006)
-0.0039
(0.005)
0.011
(0.016)
0.008
(0.016)
adjusted r2 0.988 0.988 0.988 0.890 0.902 0.963 0.876 0.902 0.959 0.969 0.201 0.193
F 206.365* 201.595* 223.856* 21.740* 24.646* 66.997* 19.176* 24.353* 60.675* 80.994* 1.615** 1.582**

*Significant at 0.99.

**Significant at 0.95.

***Significant at 0.90.

a - All independent regulatory variables are entered as dummies.

b - Dependent variable is an unweighted average calculated only among companies in which at least 85 percent of the business is known major medical.