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Table 2 Demographic and socioeconomic parameters in singleton pregnancies.

From: Analysis of preterm deliveries below 35 weeks' gestation in a tertiary referral hospital in the UK. A case-control survey

 

Control (≥ 37 weeks' gestation)

Preterm (<35 weeks' gestation)

P value

Number of deliveries

553

228

 

Median gestational age at delivery (completed weeks) and range

40 (Range 37-42)

33 (Range 23 - 34)

Not Applicable

Maternal age

   

Mean maternal age at delivery (years)

28.8 (SD 6.04)

(Range 15-44)

29.4 (SD 6.69)

(Range16-46)

0.24

   ≤ 18 years

33 (6.0%)

13 (5.7%)

 

   19-39 years

509 (92.0%)

199 (87.3)

0.002

   >39 years

11 (2.0%)

16 (7.0%)

(Comparison of proportions of mothers >39 years P < 0.001)

Body mass index

   

Mean BMI at booking (kg/m2)

25.03 (SD 5.29)

(Range 16-49)

(n = 531)

25.8 (SD 6.71)

(Range 15-60)

(n = 195)

0.10

   Lean <20

42 (7.9%)

24 (12.3%)

0.054

   Normal 20 - 29.9

402 (75.7%)

131 (67.2%)

 

   Obese ≥30

87 (16.4%)

40 (20.5%)

 

Socioeconomic

   

With social problems

60/548 (10.9%)

50/218 (22.9%)

<0.001

Smoking during pregnancy

114/553 (20.6%)

83/226 (36.7%)

<0.001

Drinking Alcohol during pregnancy

180/550 (32.7%)

75/228 (32.9%)

0.96

Using drugs during pregnancy

20/553 (3.6%)

12/226 (5.3%)

0.28