Table 2. Down Syndrome Diagnoses by Year Among States With 20-Week Abortion Bans and States Without 20-Week Abortion Bansa.
| 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | Overall | |
|---|---|---|---|---|---|---|---|---|---|
| No ban enacted | |||||||||
| Down syndrome diagnosis, No. (cases per 100 000) | 1243 (47.3) | 1335 (50.7) | 1346 (51.5) | 1290 (48.7) | 1360 (51.6) | 1397 (53.3) | 1303 (50.8) | 1347 (53.5) | 10 621 (50.9) |
| Total births, No. | 2 628 369 | 2 630 976 | 2 613 008 | 2 646 353 | 2 635 842 | 2 619 913 | 2 562 535 | 2 515 264 | 20 852 260 |
| Ban enacted | |||||||||
| Down syndrome diagnosis, No. (cases per 100 000) | 613 (48.1) | 572 (44.5) | 623 (48.4) | 670 (51.0) | 676 (51.2) | 738 (56.7) | 708 (55.7) | 730 (58.2) | 5330 (51.7) |
| Total births, No. | 1 273 898 | 1 284 975 | 1 286 338 | 1 312 524 | 1 319 797 | 1 302 315 | 1 271 092 | 1 254 307 | 10 305 246 |
| Odds of Down syndrome vs states with no ban, aOR (95% CI) | 1.19 (1.06-1.33) | 0.99 (0.88-1.11) | 1.08 (0.97-1.21) | 1.14 (1.03-1.27) | 1.10 (0.99-1.22) | 1.21 (1.10-1.34) | 1.32 (1.19-1.46) | 1.33 (1.20-1.46) | 1.17 (1.13-1.22) |
Abbreviation: aOR, adjusted odds ratio.
a
Multivariable logistic regression showing odds of Down syndrome diagnosis in states that enacted 20-week abortion ban compared with states that did not enact a ban by year. Multivariable logistic regression for all deliveries controlled for race and ethnicity, maternal age, insurance status, educational level, number of prenatal visits, and year of birth. Additional multivariable regression for each year controlled for race and ethnicity, maternal age, insurance status, educational level, and number of prenatal visits.