TABLE 8. Percentages of preterm (<37 weeks) infants among infants born with the 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, 2014.
| 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 |
14.5 |
13.5 |
66.5 |
62.4 |
—** |
100.0 |
| Alaska |
—†† |
8.6 |
80.0 |
55.9 |
—§§ |
—** |
| Arizona |
14.8 |
10.1 |
64.8 |
58.6 |
100.0 |
94.1 |
| Arkansas |
13.6 |
11.2 |
75.0 |
57.4 |
—**,†† |
76.7 |
| California¶¶ |
12.1 |
7.0 |
56.9 |
52.3 |
98.2 |
94.9 |
| Colorado |
15.6 |
8.5 |
63.0 |
57.4 |
100.0 |
88.9 |
| Connecticut |
11.9 |
7.5 |
58.1 |
50.6 |
—** |
71.1 |
| Delaware |
13.6 |
11.4 |
61.5 |
54.0 |
—§§ |
—** |
| District Of Columbia |
9.9 |
1.7 |
—†† |
52.9 |
—** |
—** |
| Florida |
14.9 |
11.5 |
59.6 |
56.6 |
100.0 |
93.1 |
| Georgia¶¶ |
14.9 |
10.9 |
70.2 |
58.0 |
100.0 |
90.9 |
| Hawaii¶¶ |
13.1 |
10.6 |
64.4 |
54.8 |
—** |
52.2 |
| Idaho |
12.9 |
8.2 |
65.7 |
60.9 |
—**,†† |
—** |
| Illinois |
13.9 |
9.8 |
62.0 |
59.4 |
100.0 |
96.8 |
| Indiana |
11.2 |
9.3 |
64.9 |
56.9 |
100.0 |
100.0 |
| Iowa |
11.0 |
9.4 |
70.9 |
59.3 |
—**,†† |
100.0 |
| Kansas |
11.6 |
9.3 |
73.8 |
58.3 |
—** |
87.0 |
| Kentucky |
11.4 |
11.0 |
68.8 |
58.7 |
100.0 |
100.0 |
| Louisiana |
17.7 |
13.2 |
74.0 |
66.7 |
—** |
93.6 |
| Maine |
12.6 |
7.3 |
62.5 |
53.4 |
—**,†† |
93.6 |
| Maryland |
13.5 |
10.4 |
60.5 |
57.7 |
—** |
100.0 |
| Massachusetts |
11.9 |
7.6 |
59.3 |
58.3 |
93.3 |
96.4 |
| Michigan |
16.7 |
10.1 |
65.6 |
57.2 |
100.0 |
89.9 |
| Minnesota |
11.6 |
8.3 |
59.3 |
52.3 |
—** |
100.0 |
| Mississippi |
16.0 |
14.2 |
81.4 |
65.5 |
—** |
66.7 |
| Missouri |
13.3 |
9.9 |
62.0 |
62.1 |
—** |
98.5 |
| Montana |
10.8 |
9.9 |
68.3 |
55.3 |
—§§ |
—** |
| Nebraska |
9.6 |
8.9 |
72.6 |
58.2 |
—** |
87.7 |
| Nevada |
15.4 |
11.5 |
73.4 |
60.3 |
—**,†† |
92.3 |
| New Hampshire |
10.9 |
7.4 |
59.3 |
52.0 |
—**,†† |
—** |
| New Jersey |
12.6 |
9.3 |
63.9 |
54.8 |
100.0 |
95.5 |
| New Mexico |
14.8 |
10.2 |
71.4 |
59.7 |
—**,†† |
100.0 |
| New York |
12.7 |
8.9 |
58.6 |
53.3 |
92.4 |
92.0 |
| North Carolina |
14.2 |
10.5 |
58.2 |
52.9 |
—** |
89.7 |
| North Dakota |
10.4 |
8.3 |
71.0 |
55.0 |
—**,†† |
68.2 |
| Ohio |
13.0 |
10.2 |
59.3 |
57.2 |
100.0 |
89.8 |
| Oklahoma |
13.1 |
11.3 |
67.2 |
61.4 |
—** |
93.4 |
| Oregon |
16.3 |
7.6 |
54.3 |
52.6 |
—** |
93.0 |
| Pennsylvania |
10.5 |
8.8 |
53.9 |
55.1 |
100.0 |
74.8 |
| Puerto Rico |
18.6 |
14.1 |
64.7 |
62.3 |
—** |
100.0 |
| Rhode Island |
7.5 |
8.7 |
—†† |
52.0 |
—**,†† |
—** |
| South Carolina |
17.3 |
11.8 |
70.3 |
57.7 |
—**,†† |
100.0 |
| South Dakota |
11.8 |
9.4 |
61.5 |
55.5 |
—** |
—** |
| Tennessee |
15.5 |
10.8 |
71.3 |
61.1 |
—** |
93.1 |
| Texas |
17.2 |
10.7 |
70.7 |
59.9 |
100.0 |
94.5 |
| Utah |
12.4 |
8.3 |
61.9 |
56.3 |
—** |
100.0 |
| Vermont |
12.5 |
6.9 |
62.5 |
47.2 |
—**,†† |
—** |
| Virginia |
11.0 |
9.1 |
61.2 |
52.6 |
100.0 |
91.3 |
| Washington |
10.5 |
8.2 |
54.3 |
52.3 |
100.0 |
80.8 |
| West Virginia |
23.4 |
11.4 |
58.8 |
64.2 |
—**,†† |
57.1 |
| Wisconsin |
11.4 |
8.6 |
67.0 |
54.6 |
—** |
96.7 |
| Wyoming |
15.2 |
9.6 |
—†† |
66.9 |
—**,†† |
—** |
| Total | 13.2 | 9.7 | 62.2 | 56.6 | 98.2 | 93.8 |
Abbreviation: ART = assisted reproductive technology.
* ART totals include infants conceived from ART procedures performed in 2013 and born in 2014 and infants conceived from ART procedures performed in 2014 and born in 2014. Total ART births exclude nonresidents and includes only infants with gestational age data available.
† In cases of missing residency data (0.6%), the patient's residence was assigned as the location in which the ART procedure was performed.
§ U.S. births include nonresidents (24).
¶ 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 from 1–4 are suppressed, as are data that can be used to derive cell values of 1–4. These values are included in totals.
§§ Estimates not calculated because N = 0 for the denominator.
¶¶ In three states, >2% of residency information was missing for procedures performed: California (2.7%), Georgia (2.1%), and Hawaii (2.1%). Overall, residency information was missing for 963 (0.6%) procedures performed and 366 (0.7%) live-birth deliveries.