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Table 1 General characteristics of the study groups.

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 559 274  
Gestational age at delivery
(completed weeks)
Median 40 (Range 37 - 42) Median 33 (Range 23 - 34) Not Applicable
Ethnicity    
Caucasian 464 (83.0%) 229 (83.6%) 0.46
Asian 45 (8.1%) 17 (6.2%)  
African 33 (5.9%) 22 (8.0%)  
Others 17 (3.0%) 6 (2.2%)  
Mean maternal age (years) 28.8 (SD 6.04)
(Range 15-44)
29.7 (SD 6.46)
(Range16-46)
0.045
Distribution of births    
   Singletons 553 (98.9%) 228 (83.2%) <0.001
   Twins 6 (1.1%) 44 (16.1%)  
   Triplets 0 2 (0.7%)