Table 1. Sample Characteristics, Optimal Bandwidth, and Total Sample, 2014 and 2015a.
| Characteristic | No. (%) | |||
|---|---|---|---|---|
| Optimal bandwidthb | Total sample | |||
| 2014 | 2015 | 2014 | 2015 | |
| FPL, % | 120-156 | 75-400 | ||
| Open enrollment | 32 091 | 55 481 | 142 176 | 213 561 |
| Age, y | ||||
| 19-25 | 4242 (13.22) | 7727 (13.93) | 18 075 (12.71) | 28 637 (13.41) |
| 26-34 | 8936 (27.85) | 15 832 (28.54) | 38 273 (26.92) | 59 199 (27.72) |
| 35-44 | 7568 (23.58) | 13 506 (24.34) | 33 099 (23.28) | 51 337 (24.04) |
| 45-54 | 5889 (18.35) | 9848 (17.75) | 25 723 (18.09) | 37 842 (17.72) |
| 55-64 | 5456 (17.00) | 8568 (15.44) | 27 006 (18.99) | 36 546 (17.11) |
| Sex | ||||
| Female | 19 017 (59.26) | 32 843 (59.20) | 86 124 (60.58) | 128 721 (60.27) |
| Male | 13 063 (40.71) | 22 612 (40.76) | 55 999 (39.39) | 84 767 (39.69) |
| Chronic condition | ||||
| Any | 8131 (25.34) | 13 257 (23.89) | 38 090 (26.79) | 52 408 (24.54) |
| None | 23 960 (74.66) | 42 224 (76.11) | 104 086 (73.21) | 161 153 (75.46) |
| Residence | ||||
| Urban | 22 578 (70.36) | 40 544 (73.08) | 98 594 (69.35) | 154 929 (72.55) |
| Rural | 3295 (10.27) | 4941 (8.91) | 14 894 (10.48) | 19 924 (9.33) |
Abbreviation: FPL, federal poverty level.
a
Source: Analysis of Colorado all-payer claims database from 2014-2015.
b
The optimal bandwidth, here defined as 120% to 156% FPL, was set using the STATA SE 14 MSE−optimal bandwidth selector for the RD treatment effect estimator e(h_mserd), defined by the command rdbwselect using the 2014 enrollment outcome.