Table 1 General characteristics of the population.
Total N = 633 | Term birth N = 610 (96.4%) | sPTB < 37 N = 23 (3.6%) | sPTB < 34 N = 7 (1.1%) | p value * | p value ** | |
---|---|---|---|---|---|---|
Maternal age (years) | 33.5 (5.3) | 33.5 (5.2) | 33.5 (6.0) | 34.5 (5.7) | 0.98 | 0.61 |
BMI | 24.0 (4.1) | 24.0 (4.0) | 25.2 (5.5) | 23.1 (3.1) | 0.16 | 0.54 |
Caucasian | 434 (68.6%) | 419 (68.7%) | 15 (65.2%) | 5 (71.4%) | 0.73 | 0.87 |
Tobacco use | 49 (7.7%) | 45 (7.4%) | 4 (17.4%) | 2 (28.6%) | 0.08 | 0.04 |
Nuliparous | 332 (52.4%) | 322 (52.8%) | 10 (43.5%) | 4 (57.1%) | 0.38 | 0.80 |
PPTB37 | 13 (2.1%) | 13 (2.1%) | 0 (0.0%) | 0 (0.0%) | 0.48 | 0.70 |
PPTB34 | 9 (1.4%) | 9 (1.5%) | 0 (0.0%) | 0 (0.0%) | 0.56 | 0.75 |
GA (weeks) | 20.8 (1.0) | 20.8 (1.0) | 20.7 (0.9) | 20.9 (0.6) | 0.67 | 0.73 |
CL (mm) | 40.7 (7.5) | 40.8 (7.5) | 38.9 (8.9) | 35.7 (8.2) | 0.25 | 0.08 |
CL < = 25 mm | 5 (0.8%) | 3 (0.5%) | 2 (8.7%) | 1 (14.3%) | 0.00 | 0.00 |
Uterine factor | 30 (4.7%) | 26 (4.3%) | 4 (17.4%) | 0 (0.0%) | 0.27 | 0.55 |
Spontaneous onset of labour | 360 (56.9%) | 337 (55.2%) | 23 (100%) | 7 (100%) | 0.00 | 0.02 |
Vaginal delivery | 472 (74.6%) | 457 (74.9%) | 15 (65.2%) | 5 (71.4%) | 0.30 | 0.85 |
GA at delivery (weeks) | 39.1 (3.1) | 39.4 (2.7) | 32.9 (5.1) | 26.9 (6.0) | 0.00 | 0.00 |
Birthweight (g) | 3276.0 (475.4) | 3300.0 (450.6) | 2641.9 (660.2) | 2509.0 (1052.6) | 0.00 | 0.00 |
Progesterone | 1 (0.1%) | 0 | 1 (4%) | 1 (14%) | 0.00 | 0.00 |