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Table 5 Complications of pregnancy.

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  
Maternal complications    
Threatened preterm labour 17/553 (3.1%) 126/228 (55.3%) <0.001
Vaginal bleeding 130/553 (23.5%) 117/228 (51.3%) <0.001
Anaemia 53/513 (10.3%) 76/224 (33.9%) <0.001
Hypertension with proteinuria 43/514 (8.4%) 52/224 (23.2%) <0.001
Hypertension without proteinuria 13/514 (2.5%) 4/224 (1.8%) 0.54
Urinary tract infection 56/514 (10.9%) 35/224 (15.6%) 0.072
HVS B Strep. 26/514 (5.1%) 12/224 (5.4%) 0.87
HVS Other organisms 70/514 (13.6%) 35/224 (15.6%) 0.47
Hyperemesis 16/514 (3.1%) 3/224 (1.3%) 0.16
Gestational Diabetes 14/514 (2.7%) 4/224 (1.8%) 0.45
Late booker 16/513 (3.1%) 8/223 (3.6%) 0.74
High Down's Risk 16/513 (3.1%) 7/224 (3.1%) >0.99
Raised AFP 4/513 (0.8%) 6/224 (2.7%) 0.075*
Fetal complications    
Reduced fetal movements 140/514 (27.2%) 76/224 (33. 9%) 0.066
Oligohydramnios 49/514 (9.5%) 65/224 (29.0%) <0.001
Fetal growth restriction 12/514 (2.3%) 41/224 (18.3%) <0.001
Large for dates 27/514 (5.3%) 8/224 (3.6%) 0.32
Fetal abnormalities 14/553 (2.5%) 15/228 (6.6%) 0.007
Other complications    
Preterm premature rupture of membranes 5/553 (0.9%) 100/228 (43.9%) <0.001
Prolonged rupture of membranes 49/553 (8.9%) 49/228 (21.5%) <0.001
  1. *Two-tailed Fisher's Exact test