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Table 1 Clinical and demographic characteristics of control and preterm cases

From: Preterm birth: seven-year retrospective study in a single centre population

Characteristics Controls (n = 7315) Preterm Cases (n = 639) p-value
Maternal age (years), mean (SD) 31.87 (6.04) 31.68 (5.65) 0.025
Pre-pregnancy weight (kg), mean (SD) 63.44 (13.98) 63.73 (13.32) 0.2
Maternal BMI, n (%) Underweight 293 (4) 102 (16) < 0.0001*
Normal 4462 (61) 262 (41)
Overweight 1682 (23) 51 (8)
Obesity 878 (12) 224 (35)
Marital status, n (%) Married 5998 (82) 492 (77) 0.003*
Unmarried 1317 (18) 147 (23)
Parity Nulliparous 4096 (56) 367 (57.5) 0.5
Parous 3219 (44) 272 (42.5)
Prior history of PTB, Yes/No, n (%) 256/7059 (3.5/96.5) 40/428 (8.5/91.5) < 0.0001*
Treatment for cervical dysplasia
 Yes/No, n (%) 110/ 7205 (1.5/98.5) 13/626 (2/98) 0.2
Cervical Length (mm), median (IQR) 38 (34–42) 31 (23–37) < 0.0001*
Uterine Anomalies, Yes/No, n (%) 66/7249 (0.9/99.1) 22/617 (3.4/96.6) < 0.0001*
Vaginal/Urinary Infections Yes/No, n (%) 1463/5852 (20/80) 115/524 (18/82) 0.02*
Poly/oligohydramnios
 Yes/No, n (%) No 7096 (97) 518 (81) < 0.0001*
Polyhydramnios 37 (0.5) 13 (2)
Oligohydramnios 182 (2.5) 102 (9)
Hypertension, Yes/No, n (%) 366/6949 (5/95) 115/524 (18/82) < 0.0001*
Thyroid disease, Yes/No, n (%) 1024/6291 (14/86) 83/556 (13/87) 0.5
Diabetes, Yes/No, n (%) 732/6583 (10/90) 93/546 (14.5/85.5) 0.004*
Maternal Surgery, Yes/No, n (%) 2677/4638 (36.6/63.4) 252/387 (39.5/60.5) 0.2
Psychological Disorders, Yes/No, n (%) 37/7278 (0.5/99.5) 7/632 (1.1/98.9) 0.3
Smoking, Yes/No, n (%) 658/6657 (9/91) 51/588 (8/92) 0.5