Table 1.

Characteristics of the Population

OverallPrePost
1995
n= 313
P for
Trend
P for
ROLOS
1992
n = 328
1993
n = 315
1994
n = 359
Mothers
Age in y, mean SD30.3 (5.1)30.1 (5.0)30.3 (5.1)30.6 (5.2)30.2 (4.9).15.18
Race,n(%)
White889 (67.6)217 (66.2)204 (64.8)247 (68.8)221 (70.6).45.79
Black250 (19.0)72 (22.0)69 (21.9)61 (17.0)48 (15.3)
Hispanic74 (5.6)18 (5.5)17 (5.4)22 (6.1)17 (5.4)
Asian71 (5.4)13 (4.0)18 (5.7)20 (5.6)20 (6.4)
Other31 (2.3)8 (2.4)7 (2.2)9 (2.5)7 (2.2)
Primapara,n(%)511 (42.9)133 (42.5)111 (39.6)138 (42.5)129 (47.3).97.28
Married,n(%)1104 (84.0)272 (82.9)264 (83.3)299 (83.3)269 (85.9).90.53
Infants
Birth weight in g,
mean SD
3507 (450)3508 (463)3475 (441)3519 (434)3523 (460).72.82
Gestational age in
wk, mean SD
40.1 (1.1)40.2 (1.2)40.1 (1.0)40.3 (1.2)40.1 (1.18).31.13