TABLE 1.

Clinical profiles and outcomes

CharacteristicMean ± SD (%) for:Pa
TotalPreterm birth groupControl group
No. of women87721856
Age (yr)28.9 ± 4.629.6 ± 6.128.9 ± 4.50.500
No. with age of <25 yr147 (16.8)4 (19.0)143 (16.7)0.999
Gestation wk at entry8.6 ± 1.18.8 ± 1.48.6 ± 1.10.348
Nulliparous482 (55.0)14 (66.7)468 (54.7)0.375
BMI at entry of <19.8b347 (39.6)5 (23.8)342 (40.0)0.176
Past history of preterm birth18 (2.1)3 (14.3)15 (1.8)0.007
Antibiotic use at <22 wk for:
    C. trachomatis28 (3.2)0 (0.0)28 (3.3)0.999
    Other reasons102 (11.6)7 (33.3)95 (11.1)0.006
Cervical cerclage19 (2.2)1 (4.8)18 (2.1)0.372
Vaginal colonization with:
    M. genitalium7 (0.8)0 (0.0)7 (0.8)0.999
    M. hominis98 (11.2)4 (19.0)94 (11.0)0.280
    U. parvum456 (52.0)16 (76.2)440 (51.4)0.027
    U. urealyticum76 (8.7)1 (4.8)75 (8.8)0.999
    Any species of mycoplasma564 (64.3)19 (90.5)545 (63.7)0.010
    More than one mycoplasma species70 (8.0)2 (9.5)68 (7.9)0.681
    C. trachomatis and any species of mycoplasma22 (2.5)0 (0.0)22 (2.6)0.999
    C. trachomatis28 (3.2)0 (0.0)28 (3.3)0.999
    N. gonorrhoeae1 (0.1)0 (0.0)1 (0.1)0.999
  • a Comparison between the preterm birth and control groups.

  • b BMI = body weight/body height squared (kg/m2).