Table 2: Characteristics of study participants by Infant IGF-I levels (ng/L).

IGF-I Levels value
≤3rd tertile ( )
>3rd tertile ( )

Maternal age at enrollment (yrs)0.65
 18–25 ( )50 (29%)28 (35%)
 26–30 ( )54 (32%)22 (27%)
 >30 ( )66 (68%)31 (38%)
Maternal BMI0.28
 <30 ( )104 (68%)55 (75%)
 ≥30 ( )48 (32%)18 (25%)
Race0.83
 African American ( )86 (51%)40 (500%)
 White ( )64 (38%)33 (4111%)
 Other ( )18 (11%)7 (9%)
Education0.38
 <High School HS Graduate/GED ( )67 (40%)28 (35%)
 Some College/College Graduate/ 99 (60%)53 (65%)
 Graduate Education ( )
Delivery route0.14
 Vaginal ( )94 (55%)55 (68%)
 Caesarean section ( )75 (44%)26 (32%)
Maternal smoking 0.63
 Never smoked ( )95 (56%)40 (49%)
 Smoked during periconception ( )27 (16%)15 (19%)
 Quit smoking before periconception ( )48 (28%)26 (32%)
Gender of infant0.29
 Male ( )75 (44%)30 (37%)
 Female ( )95 (56%)51 (63%)
Mean Gestational age in weeks (SD)*39 (1.16)39 (1.08) 0.91
Mean Birth weight (SD)*3273 (460.6)3414.74 (523.5)
0.56

Numbers do not necessarily add up due to missing values.
*Unadjusted.