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Table 4 Delivery and birth outcomes in relation to group (symptom-free (SF), nausea only (NP), and nausea and vomiting (NVP))

From: Pregnancy complications and birth outcomes among women experiencing nausea only or nausea and vomiting during pregnancy in the Norwegian Mother and Child Cohort Study

  n SF NP NVP P valuea
51 675 (n = 14 234) (n = 20 371) (n = 17 070)  
  n (%) n (%) n (%)  
Gestation length 51 675     0.001
Normal range 37–42 weeks 49 181 13 460 (94.6) 19 461 (95.5) 16 260 (95.3)  
Early birth 35–36 weeks 1545 491 (3.4) 553 (2.7) 501 (2.9)  
Very early birth 28–34 weeks 949 283 (2.0) 357 (1.8) 309 (1.8)  
Caesarean delivery 51 675     <0.001
No 44 416 12 104 (85.0) 17 654 (86.7) 14 658 (85.9)  
Planned caesarean delivery 2544 644 (4.5) 1027 (5.0) 873 (5.1)  
Emergency caesarean delivery 4065 1270 (8.9) 1447 (7.1) 1348 (7.9)  
Unspecified 650 216 (1.5) 243 (1.2) 191 (1.1)  
If yes to caesarean delivery, reason      <0.001
Breech presentation 756 283 (29.1) 258 (19.9) 215 (21.0)  
Previous caesarean delivery 447 116 (11.9) 194 (14.9) 137 (13.4)  
Pregnancy complication/ill mother 650 175 (18.0) 262 (20.2) 213 (20.8)  
Poor growth/fetus complication 198 68 (7.0) 83 (6.4) 47 (4.6)  
Own preference 314 76 (7.8) 130 (10.0) 108 (10.5)  
Other 931 255 (26.2) 371 (28.6) 305 (29.8)  
Multiple answers 465     
Mortality 51 675     0.60
Born alive, lived >1 y 51 585 14 206 (99.8) 20 340 (99.8) 17 039 (99.8)  
Born alive, died ≤1 y 90 28 (0.2) 31 (0.2) 31 (0.2)  
Anthropometry   Mean (SD) Mean (SD) Mean (SD) P valueb
Weight of placenta at birth (g) 50 115 661.5 (145.2) 677.9 (145.9) 678.3 (144.9) <0.001
Weight of infant at birth (g) 51 106 3561.5 (515.1) 3638.5 (506.4) 3605.5 (508.6) <0.001
Length of infant at birth (cm) 49 180 50.4 (2.1) 50.6 (2.0) 50.4 (2.1) <0.001
Head circ. of infant at birth (cm) 50 319 35.3 (1.5) 35.4 (1.5) 35.3 (1.5) <0.001
  1. aChi squared test
  2. bOne way analysis of variance