TABLE 1.

Negative binomial analysis of incidence rate ratios for ART births adjusted for age, race, education, marital status, and period (N = 2,079).

Parameter	Incidence risk ratios	Standard error	95% Confidence interval
Age
15–19	0.08a	0.01	0.06–0.10
20–24	0.23a	0.01	0.20–0.26
25–29	0.58a	0.03	0.52–0.63
30–34	1.00	—	1.00–1.00
35–39	1.12b	0.05	1.02–1.22
40–44	0.70a	0.03	0.64–0.78
45–49	0.28a	0.01	0.25–0.31
Race
White	1.00	—	1.00–1.00
Black	0.57a	0.03	0.52–0.62
Hispanic	0.62a	0.03	0.57–0.68
Asian/NHOPI	1.21a	0.06	1.10–1.33
Other	0.91	0.05	0.82–1.01
Education
Less than high school	0.21a	0.01	0.19–0.24
High school	0.22a	0.01	0.20–0.24
Some college	0.53a	0.02	0.48–0.58
4-year degree	1.00	—	1.00–1.00
More than 4-year degree	2.08a	0.09	1.90–2.27
Marital status
Married	5.72a	0.18	5.37–6.09
Unmarried	1.00	—	1.00–1.00
Year
2010	1.00	—	1.00–1.00
2011	0.99	0.06	0.87–1.12
2012	1.06	0.07	0.94–1.21
2013	1.16b	0.07	1.02–1.31
2014	1.16b	0.07	1.03–1.31
2015	1.27a	0.08	1.12 −1.43
2016	1.51a	0.09	1.34–1.70
2017	1.61a	0.10	1.43–1.82
Constant	0.00a	0.00	0.00–0.00
Ln dispersion parameter (alpha)	0.34a	0.01	0.32–0.37

Note: Incidence risk ratios are calculated by exponentiating the log-transformed rate ratios.

Note: NHOPI ¼ Native Hawaiian and Other Pacific Islanders.

^aP < .001.

^bP < .01.

Tierney. ART use: a population assessment. Fertil Steril 2019.