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. 2025 Oct 13;13:1643109. doi: 10.3389/fpubh.2025.1643109

Table 5.

Chi-square tests of consumer demand (C) (%) vs. insurer supply (I) (%).

Year Observed Expected Observed Expected Observed Expected
Silver-C Silver-I Bronze-C Bronze-I Gold-C Gold-I
2014 65 67 20 14 9 12
2015 69 66 21 15 6 12
2016 71 72 21 13 6 10
2017 74 73 21 13 3 8
2018 65 73 28 13 6 8
2019 61 72 30 14 7 9
2020 59 72 33 15 7 8
2021 55 75 35 15 8 7
2022 56 72 32 16 10 9
2023 54 68 32 18 12 12
2024 54 68 31 15 13 13
Chi-square statistic 20.09 143.41 10.06
p-value 0.028 <0.0001 0.435

Data on the metal plans offered by insurers (I) are calculated from the 2014–2024 HIX Compare Individual Market datasets. Data on the metal plans purchased by consumers (C) are compiled from the CMS annual open enrollment reports.