Table 1.

Maternal age at delivery and number of births among female physicians and non-physicians, 1996–2013.

Year	Physicians			Non-Physicians
	Births (N)	Maternal Age (years)		Births (N)	Maternal Age (years)
		Median	Mean ± SD		Median	Mean ± SD
1996	210	32.00	32.09 ± 2.80	306,891	27.75	27.81 ± 4.74
1997	193	31.58	31.97 ± 3.16	304,722	27.92	27.97 ± 4.73
1998	200	31.92	32.45 ± 3.22	249,546	28.08	28.09 ± 4.94
1999	244	31.50	31.94 ± 3.23	260,704	28.25	28.23 ± 4.82
2000	214	31.83	32.22 ± 3.20	278,368	28.25	28.29 ± 4.87
2001	203	31.75	31.84 ± 2.95	240,890	28.17	28.18 ± 5.01
2002	219	31.58	31.85 ± 3.08	233,401	28.08	28.19 ± 4.99
2003	236	31.67	32.02 ± 3.39	219,594	28.17	28.32 ± 4.97
2004	221	31.67	32.13 ± 3.10	212,088	28.42	28.53 ± 4.93
2005	241	31.50	32.04 ± 3.16	202,114	28.75	28.85 ± 4.92
2006	254	31.54	32.15 ± 3.16	200,042	29.17	29.15 ± 4.82
2007	291	32.08	32.41 ± 2.95	198,331	29.50	29.52 ± 4.71
2008	305	32.00	32.62 ± 3.39	191,933	29.83	29.85 ± 4.69
2009	318	32.25	32.45 ± 3.13	188,249	30.25	30.22 ± 4.61
2010	328	32.92	33.05 ± 2.92	162,392	30.83	30.64 ± 4.76
2011	391	33.08	33.32 ± 3.07	193,829	31.08	30.89 ± 4.61
2012	432	33.00	33.32 ± 3.29	228,748	31.25	31.07 ± 4.59
2013	440	33.33	33.61 ± 3.21	191,181	31.58	31.36 ± 4.78

SD: standard deviation.