Table 2.

Descriptive Characteristics of the Study Sample (n = 19,027) and the Sample Without Pathology (n = 84,666).

n (%) or Mean (SD)	Included Pathology Sample (n = 19,027)	Excluded Sample Without Pathology (n = 84,666)
Maternal age	32.0 (5.5)	31.8 (5.2)
Maternal race/ethnicity*
White	9,540 (53.6)	47,678 (59.9)
Black	2,649 (14.9)	7,571 (9.5)
Hispanic	3,113 (17.5)	14,559 (18.3)
Asian	1,487 (8.4)	5,842 (7.3)
Other	995 (5.6)	3,930 (4.9)
Nulliparous	12,146 (64.2)	40,782 (48.5)
Cesarean section	7,143 (37.6)	19,875 (23.5)
Sex, male	9,895 (52.0)	43,045 (50.8)
Preterm birth, <37 weeks	4,900 (25.8)	3,200 (3.8)
Preterm birth, <34 weeks	2,004 (10.5)	1,045 (1.2)
Small for gestational age infant	3,020 (15.9)	4,391 (5.2)

^*Missing for 1,243 of the sample with pathology and 5,086 of the sample without pathology.