The federal health insurance exchange offers health plans that are competitive, affordable and consistently meet minimum requirements, according to an analysis conducted by management consultant Abhay Padgaonkar of Innovative Solutions Consulting.

Mr. Padgaonkar examined county-level data available through HealthCare.gov, combined with demographic data from data solutions firm Synergos Technologies. Here are some of his key findings.

1. The average monthly premium for adults aged 50 or older for the second-lowest-cost silver plan is $386.

2. The average premium for the least expensive bronze plan is $174 for people under 50.