Characteristics
Characteristics
Overall PTB<37 (n=453) Overall PTB<37 (n=453) ≥37w (n=2686) ≥37w (n=2686)
OR (95%CI)
Spontaneous (sPTB) <37 (n=223) Spontaneous (sPTB) <37 (n=223) Spontaneous (sPTB) <37 (n=223) ≥37w (n=2686) ≥37w (n=2686)
OR (95%CI)
Spontaneous (sPTB) <34 (n=78) Spontaneous (sPTB) <34 (n=78) ≥34w (n=2976) ≥34w (n=2976)
OR (95%CI)
n or Mean % or ±SD n or Mean % or ±SD n or Mean % or ±SD n or Mean n or Mean % or ±SD n or Mean % or ±SD n or Mean % or ±SD
Maternal age at measurement (years) Maternal age at measurement (years) 28.7 ±7 27.8 ±7 27.4 ±6.9 27.8 27.8 ±7 27.1 ±7.2 27.9 6.9
≤19 56 12.4 405 15.1 36 16.2 405 405 15.1 15 19.2 437 14.7
20- ≤34 307 67.9 1794 67.1 1.24 (0.92 - 1.69) 152 68.5 1794 1794 67.1 0.95 (0.66 - 1.41) 49 62.8 2002 67.5 0.71 (0.41 - 1.33)
>35 89 19.7 476 17.8 1.35 (0.95 - 1.95) 34 15.3 476 476 17.8 0.80 (0.49 - 1.31) 14 17.9 525 17.7 0.78 (0.37 - 1.63)
Body-mass index (kg/m2) Body-mass index (kg/m2)
≤18.5 16 3.5 52 1.9 1.95 (1.05 - 3.43) 10 4.5 52 52 1.9 2.07 (0.96 - 4.06) 6 7.7 62 2.1 3.01 (1.10 - 6.98)
18.5-25 148 32.7 937 34.9 87 39.0 937 937 34.9 33 42.3 1026 34.5
25-30 157 34.7 913 34.0 1.09 (0.85 - 1.39) 72 32.3 913 913 34.0 0.85 (0.61 - 1.17) 23 29.5 1021 34.3 0.70 (0.40 - 1.19)
>30 132 29.1 784 29.2 1.07 (0.83 - 1.37) 54 24.2 784 784 29.2 0.74 (0.52 - 1.05) 16 20.5 867 29.1 0.57 (0.31 - 1.03)
Ethnic origin (self-reported) Ethnic origin (self-reported)
Non-white 289 63.8 1680 62.5 143 64.1 1680 1680 62.5 46 59.0 1869 62.8
White 164 36.2 1006 37.5 0.95 (0.77 - 1.16) 80 35.9 1006 1006 37.5 0.93 (0.70 - 1.24) 32 41.0 1107 37.2 1.17 (0.74 - 1.85)
Schooling Schooling
Preschool, Elementary 116 25.8 711 26.6 55 24.9 711 711 26.6 18 23.1 784 26.5
Middle School 275 61.2 1666 62.3 1.01 (0.80 - 1.28) 140 63.3 1666 1666 62.3 1.09 (0.79 - 1.51) 50 64.1 1842 62.2 1.18 (0.70 - 2.09)
High School and Higher Education 58 12.9 298 11.1 1.19 (0.84 - 1.67) 26 11.8 298 298 11.1 1.13 (0.68 - 1.81) 10 12.8 335 11.3 1.30 (0.57 - 2.79)
Comorbidities Comorbidities
No comorbidities 285 62.9 1992 74.2 163 73.1 1992 1992 74.2 50 64.1 2180 73.3
Hypertension 47 10.4 153 5.7 2.15 (1.50 - 3.02) 8 3.6 153 153 5.7 0.64 (0.28 - 1.24) 3 3.8 181 6.1 0.72 (0.17 - 1.99)
Endocrinopathies* 63 13.9 254 9.5 1.73 (1.27 - 2.33) 28 12.6 254 254 9.5 1.35 (0.87 - 2.02) 12 15.4 294 9.9 1.78 (0.90 - 3.27)
Cardiovascular disease 2 0.4 18 0. 7 0.78 (0.12 - 2.71) 1 0.45 18 18 0.7 0.68 (0.04 - 3.32) 0 0.0 20 0.7 -
Others** 56 12.4 269 10.0 1.46 (1.06 - 1.98) 23 10.3 269 269 10.0 1.04 (0.65 - 1.61) 13 16.7 301 10.1 1.88 (0.97 - 3.40)
Previous Conization(yes) Previous Conization(yes) 9 1.9 36 1.3 1.33 (0.57 - 2.73) 3 1.3 36 36 1.3 1.00 (0.24 - 2.81) 2 2.6 41 1.4 1.88 (0.30 - 6.28)
Uterine Anomaly (yes) Uterine Anomaly (yes) 9 1.9 36 1.3 1.50 (0.67 - 2.99) 3 1.3 36 36 1.3 1.00 (0.24 - 2.81) 1 1.3 38 1.3 1.00 (0.06 - 4.72)
Obstetrical history Obstetrical history
Nulliparous 205 45.4 1244 46.3 109 48.9 1244 1244 46.3 44 56.4 1363 45.8
Parous with no previous PTB 154 34.1 1217 45.3 0.77 (0.61 - 0.96) 69 30.9 1217 1217 45.3 0.65 (0.47 - 0.88) 17 21.8 1330 44.7 0.40 (0.22 - 0.68)
Parous with at least one previous PTB 93 20.6 225 8.4 2.51 (1.88 - 3.32) 45 20.2 225 225 8.4 2.28 (1.56 - 3.30) 17 21.8 282 9.5 1.87 (1.02 - 3.26)
Previous abortion (yes) 138 30.5 629 23.4 1.43 (1.15 - 1.78) 69 30.9 629 629 23.4 1.47 (1.08 - 1.97) 27 34.6 709 23.8 1.69 (1.04 - 2.70)