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. 2022 Aug 5;22:618. doi: 10.1186/s12884-022-04902-w

Table 3.

Factors associated with preterm delivery (N = 500)

Factors Mean ± SD or n (%) Univariate analysis Multivariate analysis
Term
(n = 436)
Preterm
(n = 64)
p-value Crude OR
(95% CI)
p-value Adjust OR (95% CI)
Age (years)
  18–24.9 117 (88.6) 15 (11.4) 1
  25–34.9 199 (87.7) 28 (12.3) 0.785

1.10

(0.56, 2.14)

  ≥ 35 120 (85.1) 21 (14.9) 0.390

1.37

(0.67, 2.78)

Parity
  0 252 (88.4) 33 (11.6) 1 1
  ≥ 1 184 (85.6) 31 (14.4) 0.348

1.29

(0.76, 2.18)

0.359

1.29

(0.75, 2.22)

BMI (kg/m2)
  ≤ 18 50 (90.9) 5 (9.1) 1 1
  18–25 300 (88.0) 41 (12.0) 0.530

1.37

(0.52, 3.63)

0.627

1.28

(0.48, 3.42)

  > 25 86 (82.7) 18 (17.3) 0.168

2.09

(0.73, 5.98)

0.205

2.00

(0.69, 5.81)

LUW thickness
  ≥ 4.5 mm 405 (88.0) 55 (12.0) 1 1
  < 4.5 mm 31 (77.5) 9 (22.5) 0.061

2.14

(0.97, 4.73)

0.037

2.37

(1.05, 5.32)