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Table 1 Characteristics of the participants (n = 500)

From: Association between lower uterine wall thickness measured at 18–22 weeks of gestation and risk of Preterm Birth: a prospective cohort study

  Term Delivery (n = 436) Preterm Delivery (n = 64) p-value
Characteristics n (%) Mean ± SD or Median (IQR) n (%) Mean ± SD or Median (IQR)  
Age (years)   29.5 ± 6.5   30.3 ± 6.4 0.413a
  18-24.9 117 (26.8) 21.3 ± 2.0 15 (23.4) 21.5 ± 2.1 0.646a
  25-34.9 199 (45.6) 29.5 ± 2.9 28 (43.8) 29.6 ± 2.9 0.832a
  ≥ 35 120 (27.5) 37.6 ± 2.3 21 (32.8) 37.3 ± 6.3 0.538a
Parity
  0 252 (57.8) 0 33 (51.6) 0 0.348b
  ≥ 1 184 (42.2) 1 (1,2) 31 (48.4) 1 (1,2) 0.210b
BMI (kg/m 2 )   22.1 ± 4.0   22.9 ± 4.9 0.183a
  ≤ 18 50 (11.5) 16.8 ± 0.8 5 (7.8) 16.1 ± 1.0 0.091a
  18–25 300 (68.8) 21.2 ± 1.8 41 (64.1) 20.8 ± 1.9 0.246a
  > 25 86 (19.7) 28.5 ± 3.3 18 (28.1) 29.4 ± 3.4 0.289a
Current weight (kg)   58.9 ± 10.7   61.0 ± 13.5 0.156a
  ≤ 60 268 (61.4) 52.3 ± 4.8 35 (54.7) 51.4 ± 5.4 0.292a
  60.1–80 146 (33.4) 66.4 ± 4.8 20 (31.3) 65.8 ± 3.9 0.540a
  > 80 22 (5.0) 88.7 ± 7.4 9 (14.1) 87.9 ± 4.1 0.743a
Placental location      
  Anterior 186 (42.7) - 32 (50.0)   0.283b
  Posterior 237 (54.4) - 30 (45.9)   0.285b
  Fundus 13 (3.0) - 2 (3.1)   > 0.99b
LUW thickness (mm)   6.25 ± 1.46   6.02 ± 1.37 0.230a
  < 4.5 31 (7.1) 3.9 ± 0.4 9 (14.1) 3.9 ± 0.3 0.785a
  ≥ 4.5 405 (92.9) 6.4 ± 1.3 55 (85.9) 6.3 ± 1.1 0.687a
Route of delivery      
  Spontaneous vaginal delivery 263 (60.3) - 38 (59.4) - 0.892b
  Cesarean section 164 (37.6) - 25 (39.1) - 0.890b
  Vacuum extraction 9 (2.1) - 0 - -
  Forceps extraction 0 - 1 (1.6) - -
Birth weight (g)   3134.4 ± 429.2   2417.2 ± 480.2 < 0.005a
  < 1,500 0 - 3 (4.7) 1173.3 ± 324.7 -
  1,500–2,499 18 (10.8) 2368.3 ± 145.6 36 (56.3) 2224.0 ± 229.2 0.019a
  2,500–3,999 402 (85.4) 3119.1 ± 320.4 25 (39.1) 2844.7 ± 283.2 < 0.005a
  ≥ 4,000 16 (3.2) 4380.0 ± 456.2 0 - -
  1. P value < 0.05 is considered statistically significant
  2. at-test
  3. bChi-square test