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