Table 1.

Characteristics in G3 Offspring and G2 Mother by G1 Grandmother Smoking Status and Birth Cohort

G1 Early Birth Cohort (1904 – 1928)	Total Sample	G1 Grandmother Smoking Status
		Non-Smoker	Smoker
	n = 457	n = 333	n = 92	P-value
G3 Offspring
First Born, n (%)	192 (42)	142 (43)	39 (42)	0.97
Male Sex, n (%)	254 (56)	180 (54)	59 (64)	0.08
Birth Weight, g, mean (SD)	3481 (566)	3463 (546)	3481 (600)	0.79
G2 Mother
Married, n (%)	259 (87)	190 (90)	56 (85)	0.29
Some College, n (%)	333 (73)	233 (70)	70 (76)	0.25
Smoked during G3 Pregnancy, n (%)	112 (26)	78 (25)	16 (18)	0.23
BMI at Enrollment, kg/m2, mean (SD)	26.1 (5.6)	25.9 (5.3)	26.8 (6.6)	0.35
Height at Enrollment, cm, mean (SD)	163.1 (6.0)	163.2 (6.4)	162.3 (4.6)	0.31
Age at G3 Birth, years, mean (SD)	27.0 (5.5)	26.8 (5.3)	27.3 (5.6)	0.36
Singleton Birth, n (%)	435 (95)	321 (96)	82 (89)	<0.01
First Born, n (%)	111 (24)	79 (24)	27 (29)	0.27
Birth Weight, g, mean (SD)	3316 (644)	3372 (639)	3145 (653)	0.05

G1 Late Birth Cohort (1929 – 1945)	Total Sample	G1 Grandmother Smoking Status
		Non-Smoker	Smoker
	n = 469	n = 353	n= 95	P-value
G3 Offspring
First Born, n (%)	196 (42)	144 (41)	41 (43)	0.68
Male Sex, n (%)	255 (54)	183 (52)	59 (62)	0.07
Birth Weight, g, mean (SD)	3486 (547)	3453 (547)	3630 (527)	<0.01
G2 Mother
Married, n (%)	340 (91)	265 (93)	57 (81)	<0.01
Some College, n (%)	333 (71)	246 (70)	72 (76)	0.24
Smoked during G3 Pregnancy, n (%)	115 (29)	82 (28)	30 (35)	0.19
BMI at Enrollment, kg/m2, mean (SD)	24.7 (4.8)	24.4 (4.5)	26.0 (6.1)	0.13
Height at Enrollment, cm, mean (SD)	162.9 (5.9)	163.1 (5.8)	162.6 (5.5)	0.58
Age at G3 Birth, years, mean (SD)	26.2 (5.0)	26.4 (5.1)	25.5 (4.7)	0.12
Singleton Birth, n (%)	465 (99)	349 (99)	95 (100)	0.30
First Born, n (%)	145 (31)	111 (31)	30 (32)	0.98
Birth Weight, g, mean (SD)	3277 (540)	3321 (510)	3185 (590)	0.15

BMI, Body Mass Index. Sums by G1 grandmother smoking status do not equal value in total sample because of missing data.