TABLE 8. Percentages of preterm (<37 weeks) infants among infants born with use of assisted reproductive technology* and all U.S. infants, by plurality and female patient’s reporting area of residence† at time of treatment — United States and Puerto Rico, 2015.
| Patient’s reporting area of residence | ART singleton infants (%) | All singleton infants§ (%) | ART twin infants¶ (%) | All twin infants§ (%) | ART triplets and higher-order infants¶ (%) | All triplets and higher-order infants§ (%) |
|---|---|---|---|---|---|---|
| Alabama |
17.3 |
9.6 |
83.2 |
66.4 |
—** |
97.1 |
| Alaska |
11.1 |
7.7 |
50.0 |
47.0 |
—** |
—**,†† |
| Arizona¶¶ |
14.2 |
7.5 |
70.1 |
58.6 |
100.0 |
98.8 |
| Arkansas |
7.3 |
8.9 |
60.0 |
66.1 |
—**,†† |
100.0 |
| California¶¶ |
12.0 |
6.9 |
59.3 |
55.1 |
87.1 |
99.0 |
| Colorado¶¶ |
14.0 |
7.0 |
70.1 |
59.2 |
—**,†† |
100.0 |
| Connecticut |
12.9 |
7.3 |
54.5 |
54.6 |
100.0 |
100.0 |
| Delaware |
14.6 |
8.1 |
70.0 |
58.6 |
—** |
—** |
| District of Columbia |
9.0 |
8.0 |
64.1 |
53.4 |
—§§ |
—** |
| Florida |
14.5 |
8.2 |
58.8 |
60.1 |
93.8 |
99.0 |
| Georgia |
14.7 |
8.9 |
73.3 |
62.1 |
100.0 |
97.9 |
| Hawaii¶¶ |
12.1 |
8.5 |
65.1 |
60.4 |
—** |
100.0 |
| Idaho |
13.3 |
6.4 |
60.2 |
58.0 |
—** |
100.0 |
| Illinois |
13.7 |
8.1 |
60.9 |
59.9 |
100.0 |
98.8 |
| Indiana |
11.9 |
7.8 |
65.9 |
58.5 |
—** |
100.0 |
| Iowa |
14.4 |
7.0 |
69.6 |
64.0 |
—** |
97.4 |
| Kansas |
9.9 |
7.1 |
67.5 |
56.1 |
—** |
100.0 |
| Kentucky |
15.9 |
8.9 |
68.3 |
63.0 |
—** |
100.0 |
| Louisiana |
17.3 |
10.2 |
83.1 |
70.5 |
—** |
98.0 |
| Maine |
14.4 |
6.8 |
66.7 |
56.8 |
—**,†† |
—** |
| Maryland |
12.9 |
8.2 |
62.2 |
59.0 |
—** |
100.0 |
| Massachusetts |
11.5 |
6.5 |
59.5 |
55.4 |
—** |
100.0 |
| Michigan |
14.4 |
7.9 |
61.9 |
59.6 |
100.0 |
96.3 |
| Minnesota |
10.4 |
6.8 |
60.7 |
52.8 |
100.0 |
98.0 |
| Mississippi |
16.8 |
11.0 |
65.9 |
67.8 |
—§§ |
—** |
| Missouri |
16.0 |
7.9 |
63.9 |
64.5 |
100.0 |
100.0 |
| Montana |
9.8 |
6.7 |
48.0 |
56.5 |
—§§ |
—**,†† |
| Nebraska |
15.7 |
7.5 |
62.6 |
63.7 |
—**,†† |
93.5 |
| Nevada |
13.9 |
8.2 |
56.8 |
59.3 |
—** |
90.9 |
| New Hampshire¶¶ |
8.3 |
6.2 |
53.5 |
49.6 |
—**,†† |
—** |
| New Jersey |
15.4 |
7.7 |
60.9 |
56.5 |
100.0 |
99.1 |
| New Mexico |
18.8 |
8.2 |
82.4 |
63.6 |
—§§ |
—** |
| New York |
12.1 |
6.9 |
54.0 |
53.9 |
93.9 |
99.3 |
| North Carolina |
13.7 |
8.4 |
60.0 |
57.1 |
—** |
95.4 |
| North Dakota |
6.3 |
6.9 |
69.0 |
55.7 |
—§§ |
—**,†† |
| Ohio |
11.4 |
8.3 |
61.2 |
61.1 |
100.0 |
98.1 |
| Oklahoma |
18.9 |
8.6 |
68.3 |
61.9 |
—**,†† |
100.0 |
| Oregon |
11.2 |
6.0 |
56.8 |
50.1 |
100.0 |
100.0 |
| Pennsylvania |
14.1 |
7.5 |
61.7 |
58.7 |
—** |
98.2 |
| Puerto Rico |
15.6 |
13.8 |
62.5 |
66.1 |
—** |
90.5 |
| Rhode Island |
10.3 |
6.9 |
50.0 |
51.6 |
—** |
100.0 |
| South Carolina |
12.1 |
9.1 |
64.4 |
60.8 |
—** |
100.0 |
| South Dakota |
20.3 |
6.8 |
63.6 |
56.4 |
—** |
—** |
| Tennessee |
15.0 |
9.1 |
69.3 |
62.4 |
—** |
100.0 |
| Texas |
16.1 |
8.4 |
71.5 |
62.3 |
97.3 |
98.7 |
| Utah¶¶ |
15.1 |
7.3 |
65.3 |
61.6 |
—** |
100.0 |
| Vermont |
—†† |
5.5 |
30.0 |
47.5 |
—§§ |
—**,†† |
| Virginia |
12.9 |
7.4 |
62.8 |
57.5 |
—** |
95.5 |
| Washington |
12.0 |
6.5 |
59.4 |
54.9 |
—** |
100.0 |
| West Virginia |
19.8 |
9.3 |
74.1 |
70.4 |
—** |
—** |
| Wisconsin |
13.8 |
7.6 |
62.8 |
56.9 |
100.0 |
100.0 |
| Wyoming |
16.3 |
7.8 |
54.3 |
62.5 |
—**,†† |
—** |
| Total | 13.4 | 7.9 | 62.4 | 59.0 | 97.7 | 98.6 |
Abbreviation: ART = assisted reproductive technology.
* ART totals include infants conceived from ART procedures performed in 2014 and born in 2015 and infants conceived from ART procedures performed in 2015 and born in 2015. Total ART births exclude nonresidents and includes only infants with gestational age data available.
† In cases of missing residency data (0.8 %), the patient's residence was assigned as the location in which the ART procedure was performed.
§ U.S. births include nonresidents. Source: Martin JA, Hamilton BE, Osterman MJ, Driscoll AK, Mathews TJ. Births: final data for 2015. Natl Vital Stat Rep 2017;66:1–70.
¶ Includes only the number of infants live born in a multiple-birth delivery. For example, if three infants were born in a live-birth delivery and one of the three infants was stillborn, the total number of live-born infants would be two. However, the two infants still would be counted as triplets.
** Estimates on the basis of N <20 in the denominator have been suppressed because such rates are considered unstable.
†† To protect confidentiality, cells with values of 1–4 for ART infants and cells with values of 0–9 for all infants are suppressed. Also suppressed are data that can be used to derive suppressed cell values. These values are included in the totals.
§§ Estimates not calculated because N = 0 for the denominator.
¶¶ In six states, >2% of residency information was missing for procedures performed: Arizona (4.7%), California (3.3%), Colorado (7.5%), Hawaii (5.4%), New Hampshire (3.5%), and Utah (5.8%). Overall, residency information was missing for 1,468 (0.8%) procedures performed and 623 (1.1%) live-birth deliveries.