TABLE 2—
Health Insurance Coverage and Change Between Prereform (2003–2005) and Postreform Period (2007–2009), and Massachusetts and Other New England States Stratified by Proxy Measures of Health Care Need
| Massachusetts (n = 60 388) |
Other New England States (n = 122 464) |
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| Variable | 2007–2009 Postreform, % (95% CI) | 2003–2005 Prereform, % (95% CI) | Differences and DD,a % (95% CI) | 2007–2009 Postreform, % (95% CI) | 2003–2005 Prereform, % (95% CI) | Differences and DD,a % (95% CI) | DDb and DDD,c % (95% CI) |
| All (n = 182 852) | 93.9 (93.4, 94.3) | 88.7 (88.0, 89.3) | 5.2** (4.4, 6.1) | 87.9 (87.4, 88.3) | 87.2 (86.7, 87.6) | 0.7* (0.1, 1.3) | 4.5** (3.5, 5.6) |
| Mentally unhealthy days | |||||||
| ≥ 14 d (n = 21 108) | 91.9 (90.4, 93.1) | 83.2 (80.7, 85.4) | 8.7** (6.0, 11.4) | 83.3 (81.8, 84.6) | 81.4 (79.8, 82.9) | 1.8 (-0.3, 4.0) | 6.8** (3.4, 10.3) |
| < 14 d (n = 159 629) | 94.3 (93.8, 94.7) | 89.4 (88.7, 90.1) | 4.9** (4.1, 5.7) | 88.5 (88.0, 88.9) | 88.0 (87.5, 88.4) | 0.5 (-0.2, 1.1) | 4.4** (3.3, 5.5) |
| Differences and DDd | -2.4** (-3.8, -1.0) | -6.2** (-8.6, -3.8) | 3.8* (1.0, 6.6) | -5.2** (-6.7, -3.7) | -6.6** (-8.2, -4.9) | 1.4 (-0.9, 3.6) | 2.4 (-1.2, 6.0) |
| Physically unhealthy days | |||||||
| ≥ 14 d (n = 18 982) | 93.1 (91.7, 94.2) | 87.0 (84.7, 89.1) | 6.1** (3.5, 8.6) | 84.0 (82.3, 85.5) | 83.8 (82.2, 85.3) | 0.2 (-2.0, 2.4) | 5.9** (2.5, 9.2) |
| < 14 d (n = 161 925) | 94.1 (93.6, 94.5) | 88.8 (88.1, 89.5) | 5.3** (4.4, 6.1) | 88.3 (87.8, 88.8) | 87.6 (87.2, 88.1) | 0.7* (0.0, 1.3) | 4.6** (3.6, 5.7) |
| Differences and DDc | -1.0 (-2.3, 0.4) | -1.8 (-4.1, 0.5) | 0.8 (-1.9, 3.5) | -4.3** (-5.9, -2.6) | -3.8** (-5.4, -2.2) | -0.5 (-2.8, 1.8) | 1.3 (-2.3, 4.8) |
| Activity limitation days | |||||||
| ≥ 14 d (n = 13 086) | 93.2 (91.5, 94.6) | 83.7 (80.1, 86.8) | 9.5** (5.8, 13.2) | 84.0 (82.1, 85.8) | 83.6 (81.6, 85.4) | 0.5 (-2.1, 3.1) | 9.0** (4.5, 13.5) |
| < 14 d (n = 168 602) | 94.0 (93.6, 94.5) | 89.0 (88.3, 89.7) | 5.1** (4.2, 5.9) | 88.2 (87.7, 88.6) | 87.4 (87.0, 87.9) | 0.7* (0.1, 1.4) | 4.3** (3.3, 5.4) |
| Differences and DDd | -0.9 (-2.5, 0.8) | -5.3,** (-8.7, -1.9) | 4.4* (0.6, 8.2) | -4.1** (-6.0, -2.2) | -3.9** (-5.8, -1.9) | -0.2 (-2.9, 2.5) | 4.7* (0.0, 9.3) |
Note. CI = confidence interval; DD = difference-in-differences; DDD = difference-in-difference-in-differences. Coverage percentages represent unadjusted estimates.
a
Difference-in-differences (postreform minus prereform).
b
Difference-in-differences (Massachusetts minus other New England states).
c
Difference-in-difference-in-differences (DDb ≥ 14 days minus DDd < 14 days).
d
Difference-in-differences (≥ 14 days minus < 14 days).
*P < .05; **P < .001.