Table 1

 Demographic characteristics, other maternal infections and pregnancy complications of women with and without Chlamydia trachomatis infection, Washington State 2003

Chlamydia infection (n = 851)No chlamydia infection (n = 3404)
n* (%)n* (%)
NICU, neonatal intensive care unit.
*Numbers may not add to the total because of missing data.
†According to Kotelchuck scale.20
Maternal age (years)
    13–1789 (10.5)99 (2.9)
    18–19155 (18.2)213 (6.3)
    20–24392 (46.1)850 (25.0)
    25–29123 (14.5)913 (26.8)
    30–3461 (7.2)854 (25.1)
    >3530 (3.5)474 (13.9)
Maternal race
    White494 (59.4)2441 (72.6)
    African American71 (8.5)149 (4.4)
    Native American69 (8.3)67 (2.0)
    Asian79 (9.5)303 (9.0)
    Hispanic116 (14.0)369 (11.0)
    Other2 (0.2)35 (1.0)
Unmarried598 (70.8)982 (29.0)
Maternal education (years)
    0–849 (5.9)154 (4.6)
    9–11321 (38.5)493 (14.7)
    12–13405 (48.6)1581 (47.2)
    14–2059 (7.1)1122 (33.5)
Maternal smoking during pregnancy (cigarettes/day)
    None602 (71.1)3031 (89.7)
    1–9122 (14.4)158 (4.7)
    ⩾10123 (14.5)189 (5.6)
Number of prenatal care visits (mean)9.810.7
Month prenatal care began (mean)3.12.5
Adequacy of prenatal care†
    Inadequate184 (26.3)407 (15.8)
    Intermediate240 (34.3)941 (36.6)
    Adequate222 (31.7)994 (38.6)
    Intensive54 (7.7)232 (9.0)
Other infections and complications
    Gonorrhoea23 (2.7)1 (<0.01)
    Syphilis2 (0.2)0 (0.0)
    Genital herpes45 (5.3)80 (2.4)
    Hepatitis B7 (0.8)14 (0.4)
    Hepatitis C4 (0.5)4 (0.1)
    Group B streptococcus187 (22.0)536 (15.8)
    Chorioamnionitis18 (2.1)62 (1.8)
    Newborn in NICU64 (7.6)158 (4.7)