Table 2.

Results from survival analyses examining associations between SES factors and daughter's age at menarche, before adding interaction terms, and tests of BMI mediation.

Variable	Unadjusted associations		Adjusted associations		After including BMI percent		Sobel test p
	Hazard Ratio(CI)	p	Hazard Ratio(CI)	p	Hazard Ratio(CI)	p
Child's birth year	1.02(1.01-1.03)	0.00	1.05(1.03-1.07)	0.00	1.04(1.02-1.06)	0.00	0.03
Grandfather's education (Ref=College+)
Less than High school	1.19(1.05-1.34)	0.01	1.09(0.94-1.27)	0.25	1.12(0.95-1.31)	0.17	0.45
High School	1.12(1.02-1.24)	0.02	1.06(0.94-1.19)	0.36	1.08(0.95-1.23)	0.24	0.70
Grandmother's education (Ref=College+)
Less than High school	1.18(1.02-1.37)	0.02	1.04(0.87-1.24)	0.65	1.04(0.86-1.24)	0.70	0.88
High School	1.10(0.98-1.23)	0.09	1.05(0.92-1.19)	0.47	1.06(0.92-1.21)	0.41	0.69
Mother's education at child's birth (Ref=College+)
Less than High school	1.34(1.01-1.78)	0.04	1.29(0.83-2.01)	0.25	1.71(1.17-2.49)	0.01	0.31
High School	1.05(0.96-1.14)	0.29	1.10(0.93-1.29)	0.26	1.11(0.93-1.32)	0.23	0.49
Mother's education when child was 7y (Ref=College+)
Less than High school	1.25(0.93-1.69)	0.14	0.84(0.53-1.35)	0.48	0.78(0.51-1.18)	0.24	0.62
High School	1.03(0.94-1.13)	0.48	0.91(0.78-1.06)	0.21	0.91(0.77-1.07)	0.23	0.46
Mother's marital status at birth and 7y (Ref=Married, Married)
Not married, Not married	1.46(1.31-1.62)	0.00	1.18(1.01-1.37)	0.03	1.17(1.00-1.37)	0.05	0.81
Not married, Married	1.22(1.06-1.39)	0.00	1.10(0.94-1.29)	0.23	1.08(0.91-1.27)	0.37	0.70
Married, Not married	1.12(0.97-1.29)	0.12	0.99(0.85-1.15)	0.91	1.06(0.91-1.23)	0.47	0.95
Mother's employment at child's birth (Ref=Half/Full time)
Unemployed/part time	1.06(0.95-1.19)	0.30	1.04(0.92-1.17)	0.53	1.02(0.90-1.15)	0.81	0.90
Mother's employment when child was 7y (Ref=Half/Full time)
Unemployed/part time	0.92(0.84-1.00)	0.05	0.91(0.83-1.00)	0.04	0.92(0.84-1.01)	0.08	0.21
Family income quartile at child's birth (Ref = 4)
1	1.28(1.15-1.43)	0.00	1.18(1.01-1.38)	0.04	1.15(0.97-1.36)	0.10	0.23
2	1.22(1.09-1.36)	0.00	1.12(0.97-1.29)	0.13	1.07(0.92-1.25)	0.40	0.52
3	1.09(0.98-1.20)	0.11	1.13(1.00-1.27)	0.04	1.13(1.00-1.27)	0.05	0.19
Family income quartile when child was 7y (Ref = 4)
1	1.21(1.07-1.37)	0.00	1.06(0.90-1.24)	0.48	1.03(0.88-1.21)	0.69	0.83
2	1.17(1.04-1.32)	0.01	1.09(0.94-1.27)	0.27	1.05(0.90-1.23)	0.54	0.68
3	0.93(0.83-1.05)	0.24	0.94(0.83-1.06)	0.28	0.91(0.81-1.04)	0.17	0.65
Family wealth quartile at child's birth (Ref = 4)
1	1.26(1.11-1.44)	0.00	0.93(0.77-1.12)	0.45	0.97(0.80-1.17)	0.74	0.85
2	1.09(0.97-1.22)	0.15	0.91(0.78-1.07)	0.25	0.93(0.79-1.11)	0.43	0.71
3	1.03(0.93-1.15)	0.57	1.00(0.89-1.12)	0.96	0.99(0.88-1.12)	0.92	1.00
Family wealth quartile when child was 7y (Ref = 4)
1	1.29(1.15-1.45)	0.00	1.06(0.88-1.28)	0.54	1.07(0.88-1.30)	0.51	0.76
2	1.16(1.03-1.30)	0.01	1.05(0.90-1.23)	0.52	1.10(0.93-1.30)	0.27	0.66
3	0.97(0.86-1.09)	0.56	0.99(0.87-1.13)	0.91	0.99(0.86-1.14)	0.88	0.99
Family size at birth (Ref= 1-4)
5+	1.22(1.11-1.35)	0.00	1.12(1.00-1.24)	0.04	1.10(0.99-1.24)	0.08	0.22
Family size when child was 7y (Ref= 1-4)
5+	0.99(0.90-1.08)	0.77	0.96(0.87-1.05)	0.34	0.96(0.87-1.06)	0.38	0.60
Age of mother at birth of child	1.01(1.01-1.02)	0.00	1.00(0.99-1.02)	0.62	1.00(0.98-1.02)	0.89	0.95
Mother's age at menarche	0.89(0.87-0.92)	0.00	0.89(0.86-0.91)	0.00	0.89(0.86-0.92)	0.00	<.01
Child's race (Ref=White)
Asian	1.14(0.75-1.73)	0.54	1.09(0.74-1.60)	0.66	1.17(0.80-1.72)	0.42	0.79
Black	1.33(1.22-1.45)	0.00	1.20(1.08-1.33)	0.00	1.16(1.03-1.29)	0.01	0.05
Hispanic	1.34(1.21-1.48)	0.00	1.18(1.04-1.34)	0.01	1.12(0.97-1.29)	0.12	0.21
Child's BMI percent at 8-9y	1.01(1.01-1.01)	0.00			1.01(1.00-1.01)

Note: Missing categories were included in all analyses; results not shown.