The Impact of Access Regulation on Health Insurance Market Structure. Table 10: Descriptive Statistics: Individual Market, 1995-1997 (N=150)

10/20/2000

Variable Mean Maximum Minimum Standard deviation
Population (in millions) 4.63 29.40 0.42 5.16
Number of insurers 14.14 42 2 8.38
Top five market share 87.08 100.0 67.00 8.84
Herfindahl index 0.3394 0.9572 0.1307 0.1774
Average loss ratio 0.78 1.39 0.39 .014
Guaranteed issue - all products 0.1333 1 0 0.3411
Guaranteed issue - some products 0.073 1 0 0.2616
Guaranteed renewal 0.3133 1 0 0.4654
Health rate band 0.2156 1 0 0.3801
Age rate band 0.1084 1 0 0.2504
Composite rate band 0.097 1 0 0.2482
Waiting period (in months) 0.3952 72 3 0.2616
Any limit on preexisting condition exclusions 0.5600 1 0 0.4980
BCBS market share 0.5376 0.9920 0.1320 0.2056
Commercial market share 0.3385 0.8249 0.0000 0.2173
HMO market share 0.1239 0.6482 0.0000 0.1403