Table 2.

Socio-demographic characteristics of mothers in California who gave birth to live infants from 1999 to 2003

Characteristic	Study Population* n= 2 618 752	(%)
Ethnicity
White	819 286	(31.3)
Black	162 574	(6.2)
Hispanic	1 297 073	(49.5)
Other	28 526	(13.0)
Maternal Education
< High school graduate	755 991	(29.4)
High school graduate	734 502	(28.6)
Some college	504 152	(19.6)
College graduate	576 470	(22.4)
Maternal Age
< 20 yrs	264 650	(10.1)
20–24 yrs	603 968	(23.1)
25–29 yrs	684 425	(26.1)
≥30 yrs	1 065 266	(40.7)
Infant sex
Male	1 339 292	(51.1)
Female	1 279 460	(48.9)
Infant birth weight
> 2,500gms	2 452 307	(93.6)
< 2,500gms	166 445	(6.4)

^*column totals may not sum to 2 618 752 due to missing values